Answer: Let's call the ages of the squirrels C, Celia, and Cecily, and let's represent the number of nuts they took with the variables c, ce, and ce2, respectively.
We know that the total number of nuts is 770, so we can write:
c + ce + ce2 = 770
We also know the ratios of the nuts each squirrel took relative to the others:
Cedric takes 3 nuts for every 4 nuts Celia takes, so we can write c : ce = 3 : 4, or c = (3/4)ce.
Cecily takes 7 nuts for every 6 nuts Celia takes, so we can write ce2 : ce = 7 : 6, or ce2 = (7/6)ce.
Now we can substitute these expressions into the first equation and solve for ce, the number of nuts Celia took:
(3/4)ce + ce + (7/6)ce = 770
Multiplying both sides by 12 to eliminate the fractions, we get:
9ce + 12ce + 14ce = 9240
Simplifying, we get:
35ce = 9240
Dividing both sides by 35, we get:
ce = 264
Now that we know Celia took 264 nuts, we can use the ratios to find how many nuts the other squirrels took:
Cedric took 3/4 as many nuts as Celia, so he took (3/4) * 264 = 198 nuts.
Cecily took 7/6 as many nuts as Celia, so she took (7/6) * 264 = 308 nuts.
Finally, to find how many nuts the youngest squirrel took, we can subtract the nuts taken by the other two squirrels from the total:
c + ce2 = 770 - ce
c + ce2 = 770 - 264 - 198 - 308
c + ce2 = 0
This means that the youngest squirrel did not take any nuts.
Step-by-step explanation:
The radius of a sphere is increasing at a constant rate of 2 inches per minute. At the instant when the radius of the sphere is 9 9 inches, what is the rate of change of the volume? The volume of a sphere can be found with the equation � = 4 3 � � 3 . V= 3 4 πr 3 . Round your answer to three decimal places.
Answer:
2035.752 in³/min
Step-by-step explanation:
To find the rate of change of the volume of the sphere at the instant its radius is 9 inches, we need to work out dV/dt when r = 9.
The equation for the volume of a sphere is:
[tex]V=\dfrac{4}{3}\pi r^3[/tex]
Differentiate the expression for volume with respect to r:
[tex]\begin{aligned}V&=\dfrac{4}{3}\pi r^3\\\\\implies\dfrac{\text{d}V}{\text{d}r}&=3 \cdot \dfrac{4}{3} \pi r^{3-1}\\\\\dfrac{\text{d}V}{\text{d}r}&=4 \pi r^2\end{aligned}[/tex]
We know that that the radius of a sphere is increasing at a constant rate of 2 inches per minute, so the rate of change of the radius of sphere is:
[tex]\dfrac{\text{d}r}{\text{d}t}=2[/tex]
To find an expression for dV/dt, use the chain rule:
[tex]\boxed{\dfrac{\text{d}V}{\text{d}t}=\dfrac{\text{d}V}{\text{d}r} \times \dfrac{\text{d}r}{\text{d}t}}[/tex]
Substitute the expressions for dV/dr and dr/dt to create an expression for dV/dt:
[tex]\begin{aligned}\implies \dfrac{\text{d}V}{\text{d}t}&=4 \pi r^2 \times 2\\&=8 \pi r^2\end{aligned}[/tex]
To find the value of dV/dt when r = 9, substitute r = 9 into the equation for dV/dt:
[tex]\begin{aligned}\dfrac{\text{d}V}{\text{d}t}\;\textsf{at}\;r=9\implies \dfrac{\text{d}V}{\text{d}t}&=8 \pi (9)^2\\&=8\pi (81)\\&=648\pi\\&=2035.752\; \sf in^3/min\;(3\;d.p.)\end{aligned}[/tex]
Therefore, the rate of change of the volume of the sphere at the instant when its radius is 9 inches is 2035.752 in³/min (rounded to three decimal places).
a. There are different
ways to tell whether an equation
represents a proportional
relationship. Is there one way that is
always best?
b.Explain your reasoning.
Which of the equations y = 2x and
y = 2x + 15, if either, represents a
proportional relationship?
A. only y = 2x + 15
B. neither equation
C. both equations
D. only y = 2x
Pls and thx
The equation y = 2x + 15, on the other hand, does not illustrate a proportional connection since it cannot be stated in the form y = kx. As x grows, y increases by a factor of two.
What is equation?In mathematics, an equation is a statement that states the equivalence of two expressions. An equation is made up of two sides separated by an algebraic equation (=). For example, the argument "2x + 3 = 9" contends that the phrase "2x Plus 3" equals the number "9." The purpose of equation solving is to identify the value or values of the variable(s) that will make the equation true. Simple or complicated equations, regular or nonlinear, with one or more components are all possible. For example, in the equation "x2 + 2x - 3 = 0," the variable x is raised to the second power. Lines are utilized in many areas of mathematics, including algebra, calculus, and geometry.
A. There is no one optimum approach to determine if an equation indicates a proportionate connection. One popular method is to test if the equation can be stated in the form y = kx, where k is a constant. A proportional connection is represented by an equation that may be expressed in this format.
A. Because it can be expressed as y = kx with k = 2, the equation y = 2x represents a proportional connection. As a result, D is the right answer: just y = 2x.
The equation y = 2x + 15, on the other hand, does not illustrate a proportional connection since it cannot be stated in the form y = kx. As x grows, y increases by a factor of two.
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What is the product of (-a + 3)(a + 4)? Oa²-a +12 Oa2-a-12 O-a²-a-12 O-a ²-a + 12
The product of equation (-a + 3)(a + 4) is -a² - a + 12.
What is product of equation?
Using the distributive property, we can expand the product of (-a + 3)(a + 4) as follows:
(-a + 3)(a + 4) = -a(a) - a(4) + 3(a) + 3(4)
Simplifying, we get:
(-a + 3)(a + 4) = -a² - 4a + 3a + 12
Combining like terms, we get:
(-a + 3)(a + 4) = -a² - a + 12
Therefore, the product of (-a + 3)(a + 4) is -a² - a + 12.
What is distributive property?
The distributive property is a property of arithmetic operations that is used to simplify expressions by distributing one term over another term inside parentheses.
In particular, the distributive property states that:
a × (b + c) = (a × b) + (a × c)
or
(a + b) × c = (a × c) + (b × c)
This property applies to both multiplication and addition, and can be extended to subtraction and division by adding or subtracting the distributive term to both sides of the equation.
For example, using the distributive property, we can simplify the expression:
3 × (4 + 5)
as follows:
3 × (4 + 5) = 3 × 4 + 3 × 5
= 12 + 15
= 27
In this example, we used the distributive property to distribute the term 3 over the sum (4 + 5), resulting in the equivalent expression 3 × 4 + 3 × 5.
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Write the phrase as an algebraic expression. Let x represent the unknown number.
Nineteen more than a number
The Translation is_____.
If x is the unknown number and Nineteen more than a number. Thus, Translation is 19 units on the right to get x + 19.
Explain about the Translation:Each point in a figure is moved the same distance in a single direction using a type of transformation known as translation.
In geometry, a function that transfers an object a specific distance is referred to as translation. Nothing else is done to change the object. It is not scaled, reflected, rotated, or refracted.
Give that:
x is the unknown number and Nineteen more than a number.
Then, there is a shift of 19 units on the right of x. add 19 to unknown number x to get the translation.
x + 19
Thus, Translation is 19 units on the right to get x + 19.
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Find measure of angle 14. (Just enter the number, no symbols)
A
The measure of angle 14 is 83° in the parallel line t and s and transversal n.
What is parallel line?Parallel lines are a pair of lines in a two-dimensional plane that never intersect or cross each other, regardless of how far they are extended in either direction. Parallel lines have the same slope, which determines their steepness or inclination, and they maintain the same slope throughout their length.
What is transversal?A transversal is a line that intersects two or more other lines in a plane at distinct points. Specifically, if two or more lines in a plane are intersected by a third line, that third line is called a transversal. The lines being intersected are referred to as the "transversed lines".
According to the given information:
Given the parallel lines are t and s, the transversal are line m and n
the given angles are ∠2 = 97° and ∠6 = 83°
In the parallel lines t and s , line n is transversal
By the property that "corresponding angles are equal"
we can say that ∠5 =∠13, ∠7 =∠15, ∠6= ∠14, ∠8=∠16
given ∠6 = 83°, We know that ∠6= ∠14
∠14 = 83° (Corresponding angles are equal)
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suppose a simple random sample of 150 students is drawn from a population of 3000 college students. among sampled students, the average iq score is 115 with a standard deviation of 10. what is the point estimate? group of answer choices 3000 115 unable to tell. not enough information given. 10
115.
The point estimate for the average IQ score of the population of 3000 college students based on a simple random sample of 150 students with an average IQ score of 115 and a standard deviation of 10 is 115.
Therefore, the correct option is 115.
A point estimate is an estimate of a population parameter based on a single value or point. It is obtained by using statistics collected from a sample to infer population values. It can be a single value or a range of values that best represents the unknown population parameter.
Based on the given information, a simple random sample of 150 students is drawn from a population of 3000 college students.
Among sampled students, the average IQ score is 115 with a standard deviation of 10. The point estimate, in this case, is the average IQ score of the population, which is estimated to be 115 based on the sample data.
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obsessivex avatar
obsessivex
17 hours ago
Mathematics
High School
Question 2(Multiple Choice Worth 2 points)
(Comparing Data MC)
The line plots represent data collected on the travel times to school from two groups of 15 students.
A horizontal line starting at 0, with tick marks every two units up to 28. The line is labeled Minutes Traveled. There is one dot above 4,6,14, and 28. There are two dots above 10, 12, 18, and 22. There are three dots above 16. The graph is titled Bus 47 Travel Times.
A horizontal line starting at 0, with tick marks every two units up to 28. The line is labeled Minutes Traveled. There is one dot above 8, 9,18, 20, and 22. There are two dots above 6, 10, 12,14, and 16. The graph is titled Bus 18 Travel Times.
Compare the data and use the correct measure of variability to determine which bus is the most consistent. Explain your answer.
Bus 18, with an IQR of 16
Bus 47, with an IQR of 24
Bus 18, with a range of 16
Bus 47, with a range of 24
obsessivex
Based on the IQR values, we conclude that Bus 18 is more consistent than Bus 47, as it has smaller IQR. This means the travel times of students on Bus 18 are more tightly clustered around the median, and are fewer outliers in data.
What is line plots?A line plot is a type of graph that displays data as points or dots along a number line. Each dot or point represents a single data value, and the number line shows the range of the data. Line plots are useful for displaying small to moderate-sized data sets and for identifying the central tendency and variability of the data.
To determine which bus is the most consistent, we need to look at the variability of data. The most appropriate measure of variability for this purpose is the interquartile range (IQR), which is the range of the middle 50% of the data.
From the given data, we can calculate the IQR for both buses as follows:
For Bus 18:
Lower quartile (Q1) = 8
Upper quartile (Q3) = 24
IQR = Q3 - Q1 = 24 - 8 = 16
For Bus 47:
Lower quartile (Q1) = 10
Upper quartile (Q3) = 34
IQR = Q3 - Q1 = 34 - 10 = 24
The range, which is the difference between the maximum and minimum values, is not as appropriate a measure of variability for this purpose, as it is heavily influenced by outliers. Therefore, we cannot use the range to determine the consistency of the data for either bus.
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Help is due today!!
For a certain value of k, the system,
x+y=3z=10,
4x+2y+5z=7,
kx+z=3,
has no solutions. What is the value of k? (the answer is not 2,6,2/7,or 7/2)
The value of k given the system of equations is 2
Calculating the value of kGiven that
x + y + 3z = 10
4x + 2y + 5z = 7
kx + z = 3
Eliminate y in the first two equations
So, we have
2x + 2y - 6z = 20
4x + 2y + 5z = 7
kx + z = 3
Subtract the first two equations
So, we have
2x + z = -13
kx + z = 3
When it has no solution, we have
kx + z = 2x + z
Evaluate
k = 2
Hence, the value of k is 2
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If the point D is the center of dilation, what is the scale factor?
With D as Center of dilation, the scale factor is √2.
What exactly is scaling factor?In mathematics, a scaling factor is a ratio that describes how much a figure or object has been enlarged or reduced in size. A scaling factor is typically expressed as a fraction or decimal that represents the relative change in size between the original figure and the new, scaled figure.
Now,
To find the scale factor of dilation, we can use the distance formula to find the ratio of corresponding sides in the original and dilated triangles.
The distance between points A and B in the original triangle is:
[tex]\rm AB = \sqrt{(x_2 - x_1)\² + (y_2 - y_1)\²}[/tex]
[tex]= \sqrt{(0 - (-1))\² + (1 - (-1))\²} \\\\= \sqrt{1\² + 2\²}[/tex]
= √5
The distance between points A' and B' in the dilated triangle is:
[tex]\rm A'B' = \sqrt{(x_2' - x_1')\² + (y_2' - y_1')\²}[/tex]
[tex]= \sqrt{(-2 - (-1))\² + (-5 - (-2))\²}[/tex]
[tex]= \sqrt{1\² + 3\²}[/tex]
= √10
Therefore, the scale factor for the dilation is:
Scale factor = A'B' / AB = √10 / √5 = √2
Hence, the scale factor of dilation is √2.
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Can someone help me ASAP it’s due tomorrow. I will give brainliest if it’s all done correctly.
Answer:
Step-by-step explanation:
Refers to the attachment given below!
the extract of a plant native to taiwan has been tested as a possible treatment for leukemia. one of the chemical compounds produced from the plant was analyzed for a particular collagen. the collagen amount was found to be normally distributed with a mean of 61 and standard deviation of 9.8 grams per mililiter. a. what is the probability that the amount of collagen is greater than 60 grams per mililiter? b. what is the probability that the amount of collagen is less than 90 grams per mililiter? c. what percentage of compounds formed from the extract of this plant fall within 1 standard deviation of the mean?
a. The probability that the amount of collagen is greater than 60 grams per mililiter is 0.5398
b. The probability that the amount of collagen is less than 90 grams per mililiter is 0.9985.
c. Approximately 68% of the data falls within 1 standard deviation of the mean for a normally distributed dataset.
a. To find the probability that the amount of collagen is greater than 60 grams per milliliter, we'll use the z-score formula:
z = (X - μ) / σ
where X is the value we're interested in, μ is the mean, and σ is the standard deviation.
z = (60 - 61) / 9.8 ≈ -0.1
Now, we'll use a z-table or calculator to find the probability corresponding to this z-score.
A z-score of -0.1 corresponds to a probability of approximately 0.4602.
Since we're looking for the probability that the amount of collagen is greater than 60 grams per milliliter, we need to find the area to the right of this z-score:
P(X > 60) = 1 - P(X ≤ 60) = 1 - 0.4602 ≈ 0.5398
b. To find the probability that the amount of collagen is less than 90 grams per milliliter, we'll again use the z-score formula:
z = (90 - 61) / 9.8 ≈ 2.96
A z-score of 2.96 corresponds to a probability of approximately 0.9985.
Since we're looking for the probability that the amount of collagen is less than 90 grams per milliliter, we'll use this probability directly:
P(X < 90) ≈ 0.9985
c. To find the percentage of compounds formed from the extract of this plant that fall within 1 standard deviation of the mean, we'll use the empirical rule (68-95-99.7 rule), which states that approximately 68% of the data falls within 1 standard deviation of the mean for a normally distributed dataset.
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Sam has a deck that is shaped like a triangle with a base of 18 feet and a height of 7 feet. He plans to build a 2:5 scaled version of the deck next to his horse’s water trough.
Part A: What are the dimensions of the new deck, in feet? Show every step of your work.
Part B: What is the area of the original deck and the new deck, in square feet? Show every step of your work.
Part C: Compare the ratio of the area to the scale factor. Show every step of your work.
Answer:
A) The dimensions of the new triangular deck are:
base = 45 feetheight = 17.5 feetB) Area of original deck = 63 square feet
Area of new deck = 393.75 square feet
C) The ratio of the area is 4 : 25. This is the square of the scale factor.
Step-by-step explanation:
Part AThe given scale is 2 : 5. This means that the ratio of the measurements of the corresponding sides of two objects is 2 to 5. In other words, if one object has a length of 2 units, the corresponding length of the other object is 5 units. So in this scenario, a 2 : 5 scaled version means that for every 2 foot of the original deck, there is 5 foot of the new deck.
Therefore, if the original base of the triangle is 18 feet, the new base, b, will be:
[tex]\implies \sf 2 : 5 = 18 : b[/tex]
[tex]\implies \sf \dfrac{2}{5} = \dfrac{18}{b}[/tex]
[tex]\implies \sf 2 \cdot b=18 \cdot 5[/tex]
[tex]\implies \sf b=\dfrac{18 \cdot 5}{2}[/tex]
[tex]\implies \sf b=45\;ft[/tex]
Similarly, if the original height of the triangle is 7 feet, the new height, h, will be:
[tex]\implies \sf 2 : 5 = 7 : h[/tex]
[tex]\implies \sf \dfrac{2}{5} = \dfrac{7}{h}[/tex]
[tex]\implies \sf 2 \cdot h=7 \cdot 5[/tex]
[tex]\implies \sf h=\dfrac{7\cdot 5}{2}[/tex]
[tex]\implies \sf h=17.5\;ft[/tex]
Therefore, the dimensions of the new triangular deck are:
base = 45 feetheight = 17.5 feet[tex]\hrulefill[/tex]
Part BThe area of a triangle is half of the product of its base and height:
[tex]\boxed{\sf A=\dfrac{1}{2}bh}[/tex]
Area of the original deck:
[tex]\implies \sf A=\dfrac{1}{2} \cdot 18 \cdot 7[/tex]
[tex]\implies \sf A=9 \cdot 7[/tex]
[tex]\implies \sf A=63\;ft^2[/tex]
Area of the new deck:
[tex]\implies \sf A=\dfrac{1}{2} \cdot 45\cdot 17.5[/tex]
[tex]\implies \sf A=22.5 \cdot 17.5[/tex]
[tex]\implies \sf A=393.75\;ft^2[/tex]
Therefore, the areas of the two decks are:
Area of original deck = 63 square feetArea of new deck = 393.75 square feet[tex]\hrulefill[/tex]
Part CThe ratio of the area of the original deck to the area of the new deck is:
[tex]\implies \textsf{Area original deck}:\textsf{Area new deck}=\sf 63 : 393.75[/tex]
To rewrite the ratio in its simplest form, multiply both sides of the ratio by 16:
[tex]\implies \sf 63 \cdot 16: 393.75 \cdot 16=1008 :6300[/tex]
Then divide both sides of the ratio by 252:
[tex]\implies \sf \dfrac{1008}{252}:\dfrac{6300}{252}=4:25[/tex]
Therefore, the ratio of the area of the original deck to the area of the new deck in its simplest terms is 4 : 25.
If we compare this to the original scale factor 2 : 5 (which is the ratio of length), we can see that the ratio of area is the square of the scale factor:
[tex]\implies \sf 2^2:5^2=4:25[/tex]
an integer is randomly chosen from the integers $1$ through $100$, inclusive. what is the probability that the chosen integer is a perfect square or a perfect cube, but not both? express your answer as a common fraction.
The probability that the chosen integer is a perfect square or a perfect cube but not both is therefore 13/100.
When choosing an integer from 1 to 100, there are 10 perfect squares (1² to 10²) and 4 perfect cubes (1³ to 4³). However, the number 1 is both a perfect square and a perfect cube. To avoid counting it twice, we use the formula for the union of two sets: |A∪B| = |A| + |B| - |A∩B|. In this case, |A∪B| represents the number of integers that are either a perfect square or a perfect cube. Plugging in the values, we get |A∪B| = 10 + 4 - 1 = 13. The probability is therefore 13/100.
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What is the area of the rectangle?
Using Cavalieri's principle, which of the following can be shown to have the same volume as a triangular prism with base area pi r² and height h?
Hence, a cylinder with height h and base area [tex]\pi r^{2}[/tex] may be proven to have the same volume as a triangular prism.
What is a cylinder?Two parallel circular bases joined by a curving surface form the three-dimensional geometric object known as a cylinder. Due of its parallel and congruent bases, it is a sort of prism.
When someone uses the word "cylinder,” they often mean a right circular cylinder with circles for bases and an axis that is perpendicular to the bases' planes.
A cylinder's volume may be calculated using the formula V = [tex]r^{2}[/tex]h, where r denotes the perimeter of the base and h the height of the cylinder. L = 2rh, where r is the radius of a base and h is the height of the cylinder, is the formula for a cylinder's lateral surface area.
Cavalieri's principle states that if two solid objects have the same height and every cross-section taken perpendicular to a common axis has the same area, then the two objects have the same volume.
Let's consider the given triangular prism with base area [tex]\pi[/tex][tex]r^2[/tex] and height h. If we take a cross-section perpendicular to the base at a height y, we get a circle with radius r multiplied by a triangle with base 2r and height y. The area of this cross-section is:
[tex]A(y) = \pi r^2 + (2r)(y) / 2[/tex]
Simplifying, we get:
[tex]A(y) = \pi r^2 + ry[/tex]
Now, let's consider a cylinder with base area pi r² and height h. If we take a cross-section perpendicular to the height at a height y, we get a circle with radius r multiplied by a rectangle with base 2r and height h. The area of this cross-section is:
[tex]A'(y) = \pi r^ + (2r)(h) = \pi r^2 + 2rh[/tex]
By Cavalieri's principle, the triangular prism and the cylinder have the same volume if A(y) = A'(y) for all y from 0 to h. Let's check:
[tex]\pi r^² + ry = \pi r^² + 2rh[/tex]
[tex]ry = 2rh[/tex]
[tex]y = 2r[/tex]
So, we see that the areas are equal for all y between 0 and h, except at [tex]y = 2r.[/tex] However, this is just a single point and has no effect on the volume,
Therefore, the cylinder with base area [tex]\pi[/tex][tex]r²[/tex] and height h has the same volume as the triangular prism, with base area [tex]\pi[/tex]r² and height h.
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new car owners were asked to evaluate their experiences in buying a new car during the past 12 months. in the survey, the owners indicated they were most satisfied with their experiences at the following three dealers (in no particular order): subaru, honda, and buick. assuming that each set of rankings is equally likely, what is the probability that owners ranked subaru third? question 5 options: 1/3 1/6 1/2 5/6 6/6
The probability that owners ranked Subaru third is 2/6, which reduces to 1/3. Therefore, the correct answer is 1/3.
To find the probability that owners ranked Subaru third, we need to find out the total number of possible rankings for
the three dealers: Subaru, Honda, and Buick.
There are three possible rankings for the first choice, two for the second choice, and one for the third choice.
Therefore, there are 3 x 2 x 1 = 6 possible rankings for the dealers.
Since each of the possible rankings is equally likely, the probability that owners ranked Subaru third is the number of
ways to rank Subaru third divided by the total number of possible rankings.
Subaru can be ranked third in two out of the six possible rankings:
Subaru, Honda, Buick Honda, Buick, Subaru
Therefore, the probability that owners ranked Subaru third is 2/6, which reduces to 1/3.
Therefore, the correct answer is 1/3.
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I need help with this algebra 2. If you don’t know please don’t respond .
Required true statements are B, C, D, G, H, I, L, M.
What is factor?
In mathematics, factors refer to the numbers that can be multiplied together to obtain a given number. For example, the factors of 12 are 1, 2, 3, 4, 6, and 12.
Based on the given factors, we can conclude that:
f(x) has a factor of 3, which means that 3 is a root/solution of f(x).
f(x) has a factor of (2x-1), which means that 2x-1=0 or x=1/2 is a root/solution of f(x).
f(x) has a factor of (x+5), which means that x+5=0 or x=-5 is a root/solution of f(x).
Using these facts, we can determine which statements are true:
A) -1/2 is not a root/solution of f(x). (False)
B) We can check if this expression is equivalent to f(x) by factoring it:
6x² - 33x - 15 = 3(2x² - 11x - 5) = 3(x - 5)(2x + 1).
This shows that f(x) has factors of 3, (2x-1) and (x+5), so this statement is true.
C) -5 is a root/solution of f(x). (True)
D) 3 is a root/solution of f(x). (True)
E) We can check if this expression is equivalent to f(x) by factoring it:
2x²+9x-5 = (2x - 1)(x + 5), which is not the same as the factors given for f(x), so this statement is false.
F) 0 is not necessarily a root/solution of f(x), since the factors given do not guarantee that f(x) intersects the x-axis at 0. (False)
G) We can check if this expression is equivalent to f(x) by factoring it:
6x²+27x-15 = 3(2x²+9x-5) = 3(2x-1)(x+5), which shows that f(x) has the same factors as this expression, so this statement is true.
H) 1/2 is a root/solution of f(x). (True)
I) 5 is a root/solution of f(x). (True)
J) We can check if this expression is equivalent to f(x) by factoring it:
2x²-9x-5 = (2x + 1)(x - 5), which is not the same as the factors given for f(x), so this statement is false.
K) -3 is not necessarily a root/solution of f(x), since the factors given do not guarantee that f(x) intersects the x-axis at -3. (False)
L) To find the x-intercepts of f(x), we need to set f(x) equal to zero and solve for x:
f(x) = 3(x + 5)(2x - 1) = 0
This equation has roots of x=-5 and x=1/2, which means that the x-intercepts of f(x) are (-5, 0) and (1/2, 0). So, this statement is true.
M) To find the x-intercepts of f(x), we need to set f(x) equal to zero and solve for x:
f(x) = 3(x + 5)(2x - 1) = 0
This equation has roots of x=-5 and x=1/2, which means that the x-intercepts of f(x) are (-5, 0) and (1/2, 0).
So, this statement is true.
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An economist would like to estimate the average household income in Martin county. The mean household
income of a random sample of 227 families in Martin county was found to be $52,939. The standard
deviation of the household incomes of all households in Martin county is known to be $1,227.
Using a 96% confidence level, determine the margin of error, E, and a confidence interval for the average
household income in Martin county. Report the confidence interval using interval notation. Round solutions
to two decimal places, if necessary.
Therefore , the solution of the given problem of average comes out to be 96% confidence interval is ($52,791.38, $53,086.62).
What is average?The result of a collection, also known as the arithmetic mean, is the sum of all values split by all of the values. One of the most commonly used primary trend indicators, it is frequently referred to as "mean." Multiply the total number of numbers in the collection by each value to get the result. Calculations can be performed using either the raw data or data that has been merged into frequency charts.
Here,
The error margin (E) is equal to z* (standard deviation / sqrt(n)).
Interval of confidence equals sample mean E
Where n is the sample size, z* is the critical value for the required confidence level, and s is the population standard deviation.
We can enter the provided values into the margin of error formula as follows:
=> E = 2.05 * (1227 / sqrt(227))
=> E ≈ 147.62
Therefore, the error range is roughly $147.62.
Next, we can create the confidence interval using the group mean and margin of error:
Interval of confidence equals sample mean E
=> Confidence range is between $52,939 and $147.62.
=> Interval of confidence = ($52,791.38, $53,086.62)
Therefore, the range of the typical household income in Martin County within the 96% confidence interval is ($52,791.38, $53,086.62).
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using the p-value rule for a population proportion or mean, if the level of significance is less than the p-value, the null hypothesis is rejected. group startstrue or false
The given statement "Using p-value rule for a population proportion or mean, if the level of significance is less than p-value, null hypothesis is rejected." is True because the hypothesis is rejected in this case.
In hypothesis testing, the p-value is the probability of observing a test statistic as extreme as, or more extreme than, the observed test statistic, assuming that the null hypothesis is true. The level of significance, denoted by alpha, is the maximum probability of rejecting the null hypothesis when it is actually true.
If the p-value is less than the level of significance, it means that the observed test statistic is unlikely to have occurred by chance alone, assuming the null hypothesis is true. Therefore, we reject the null hypothesis in favor of the alternative hypothesis at the given level of significance.
For example, suppose we are testing the hypothesis that the population mean is equal to a certain value. If the p-value is 0.02 and the level of significance is 0.05, we would reject the null hypothesis because the p-value is less than the level of significance.
This means that there is strong evidence against the null hypothesis and we can conclude that the population mean is likely different from the hypothesized value.
In summary, if the level of significance is less than the p-value, we reject the null hypothesis in favor of the alternative hypothesis at the given level of significance.
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Sarah visited a tree nursery. She measured and recorded the heights of some young trees. This line plot shows her results.
How much taller is one of the tallest trees than one of the shortest trees?
Enter your answer as a mixed number in simplest form by filling in the boxes.
Answer:
3 and 1/2
Step-by-step explanation:
7 and 1/2 - 4
A tower is composed of a prism with a square base and a pyramid. the base length is 20 meters, and the height of the prism is 40 meters, while the slant height of the pyramid is 10√2 meters. what is the total surface area, including the bottom base? 400√2 3,600 m2 200√2 3,600 m2 400√2 400 m2 4000√2 m2
The total surface area of the tower, including the bottom base, is [tex]3600+400\sqrt{2}[/tex] square meters.
The surface area of the tower can be found by calculating the surface area of the prism and the surface area of the pyramid separately, and then adding them together.
The surface area of the square base of the prism is [tex]20^2 = 400[/tex] square meters.
The lateral surface area of the prism is the product of the perimeter of the base and the height, which is [tex]4*(20)*40 = 3200[/tex] square meters.
The surface area of the pyramid is given by the formula:
base area + 1/2(perimeter of base)(slant height)
The base area of the pyramid is [tex]20^2 = 400[/tex] square meters. The perimeter of the base is 4(20) = 80 meters. Therefore, the surface area of the pyramid is:
[tex]400 + [(\frac{1}{2})*(80)(10\sqrt{2})] = 400 + 400\sqrt{2}[/tex] square meters.
The total surface area of the tower is the sum of the surface area of the prism and the surface area of the pyramid, which is:
[tex]3200 + 400 + 400\sqrt{2} = 3600 + 400\sqrt{2}[/tex] square meters.
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give the required elements of the hyperbola y^2/9-x^2/81=1
The hyperbola opens:
Vertically
Horizontally
By answering the presented question, we may conclude that equation Asymptotes: y = ±(3/9)x and y = ±(-3/9)x, which simplify to y = ±(1/3)x and y = ∓(1/3)x. and The hyperbola opens Vertically.
What is equation?In mathematics, an equation is a statement that states the equivalence of two expressions. An equation is made up of two sides separated by an algebraic equation (=). For example, the argument "2x + 3 = 9" contends that the phrase "2x + 3" equals the number "9." The purpose of equation solving is to identify the value or values of the variable(s) that will make the equation true. Simple or complicated equations, regular or nonlinear, with one or more components are all possible. For example, in the equation[tex]"x2 + 2x - 3 = 0,[/tex]" the variable x is raised to the second power. Lines are utilized in many areas of mathematics, including algebra, calculus, and geometry.
Center: (0,0)
Transverse axis length: 2a = 2*3 = 6
Conjugate axis length: 2b = 2*9 = 18
Vertices: (0,±3)
Foci: (0,±√18)
Asymptotes: y = ±(3/9)x and y = ±(-3/9)x, which simplify to y = ±(1/3)x and y = ∓(1/3)x.
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Hue is arranging chair. She can form 6 rowsof a given lengtj with 3 chairs left over, or 8 rows of that same length if she gets 11 more chairs. Write and solve an equation to find how many chairs are in that row length.
Hue is arranging chair, She can form 6 rows of a given length with 3 chairs left over, or 8 rows of that same length if she gets 11 more chairs. There are 7 chairs in that row length.
What is row?A row is anything that is arranged in a series, such as a sequence of figures on a worksheet or stitches on a knitting needle. A row is anything that is arranged in a straight line, such as a line of penguins at the zoo, tulips in a yard, or tuba players moving in your town's Fourth of July procession.
Suppose the number of chairs in a row is 'x' and total number of chairs are 'y'.
Given:
Hue can form 6 rows of a given length with 3 chairs left over.
From that we get
y=6x+3 ………… (1)
Or she can form 8 rows of that same length if she gets 11 more chairs.
We get
y=8x-11 …………(2)
We can put the value of y from the equation 1 in equation 2
6x+3=8x-11
Or, 2x=14
Or, x=7
X is the number of chairs present in a row length. So that is 7.
Hence there are 7 chairs in that row length
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Help asap :(((((((((((((((((((((
Answer:151
Step-by-step explanation:
Addition of 107 and 44
The value of the angle m∠EFG is 151.
We have,
From the figure,
m∠EFG = m∠EFH + m∠HFG
Now,
Substituting the values in the angle.
m∠EFG
= m∠EFH + m∠HFG
= 44 + 107
= 151
Thus,
The value of the angle m∠EFG is 151.
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I NEED HELP ASAP! The average high temperatures in degrees for a city are listed.
58, 61, 71, 77, 91, 100, 105, 102, 95, 82, 66, 57
If a value of 71° is changed to 93°, which of the following measures changes the most and what is the new value?
Mean 82.3°
Median 86.5°
Range 48°
IQR 34°
Answer:
The new value of the list after changing 71° to 93° would be:
58, 61, 93, 77, 91, 100, 105, 102, 95, 82, 66, 57
The measure that changes the most would be the median. Without the change, the median was 86.5°, which was the average of the 7th and 8th values in the list (100 + 77) / 2. However, after changing 71° to 93°, the median becomes 91°, which is the average of the 6th and 7th values in the list (91 + 91) / 2.
Therefore, the median has changed by 4.5° (from 86.5° to 91°).
I need this for a quiz to pass my grade HELP!!!!!
Jake plans to use a ramp to make it easier to move a piano out of the back of his truck. The back of the truck is
83
8383 centimeters tall and the ramp is
158
158158 centimeters long.
What is the horizontal distance from the end of the ramp to the back of the truck?
Round your answer to the nearest tenth of a centimeter.
Answer:
Step-by-step explanation:
This can be solved using Pythagorean Theorem.
a² + b² = c²
8383² + b² = 158158²
70274689 + b² = 25013952964
70274689 - 70274689 + b² = 25013952964 - 70274689
b² = 24943678275
√b² = √24943678275
b = 157935.7 cm
Find the missing dimension of the cone. Volume=1/18
r=2/3
Answer:
Step-by-step explanation:
The formula to calculate the volume of a cone is:
v = h * π * r ^ 2/3
Where,
h: height
r: radio
We then clear the value of h:
h = (3 * v) / (π * r ^ 2)
We substitute the values:
h = (3 * (118π)) / (π * ((2/3) / (2)) ^ 2)
h = 3186 ft
Answer:
The height of the cone is:
h = 3186 ft
Use what you know about the patterns in area models to determine which two area models correctly represent a factorable polynomial in the form of ax 2 + bx + c where c = 40. The middle “b” term is unknown.
The correct area models are 4e and none of the given models for 4d and 4c.
What is the quadratic equation?
The solutions to the quadratic equation are the values of the unknown variable x, which satisfy the equation. These solutions are called roots or zeros of quadratic equations. The roots of any polynomial are the solutions for the given equation.
The area model of 4c is incorrect because the last term of the polynomial, which is 40, is represented by the bottom right box of the area model. However, in the given area model, the box representing 40 is in the upper row.
The area model of 4e is correct because it represents the polynomial as the product of two binomials, where the factors are (x-5) and (x-8).
When multiplied using the distributive property, the resulting polynomial is x² - 13x + 40, which matches the given polynomial form.
The area model of 4d is incorrect because it does not properly represent a factorable polynomial.
It only includes three boxes, representing the three terms of the polynomial, but it does not show how the terms can be factored into binomials.
Therefore, the correct area models are 4e and none of the given models for 4d and 4c.
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you have a summer job that pays time and a half for overtime. that is, if you work more than 40 hours per week, your hourly wage for the extra hours is 1.5 times your normal hourly wage of $7. what does the slope of a line segment represent in the context of this situation?
The slope of a line segment represent in the context of this situation is the total wages for the week.
We have seen lines drawn on the coordinate plane in geometry. The best approach to determine without using any geometrical tools if the lines are parallel, perpendicular, or at any angle is to measure the slope.
A line's slope in mathematics is defined as the ratio of the change in the y coordinate to the change in the x coordinate.
Both the net change in the y-coordinate and the net change in the
x-coordinate are denoted by y and x, respectively.
Thus, the formula for the change in y-coordinate with regard to the change in x-coordinate is
[tex]m=\frac{y}{x} =\frac{change \ in \ y}{change\ in\ x}[/tex]
You are a crew at a Convenience store that pays an hourly wage $ 7 and 1.5 times the hours wage for the extra hours if you work for more than 40 hours a week. Write a piecewise function that gives the weekly pay P in term of the number of hours h your work.
→ wages for 1 hours = $ 7
So,
we can say that, wages for 40 hours, = 7 x 40 = 280 .
Therefore,
→ Total wages of week is = 280.
Piecewise function is :-
P(h) = 280 , where h ≤ 40.
Now, we have given that, store gives 1.5 times the hours wage for the extra hours if you work for more than
40 hours a week.
So,
→ wages per hour now = 1.5 x 7 = 10.5 .
Therefore,
→ Total wages of week
= 280 + 10.5(h - 40)
= 280 + 10.5h - 420
= 10.5h - 140.
and,
Piecewise function that gives the weekly pay P in term of the number of hours h your work is:
P(h) = 280 + 10.5(h - 40), where [h > 40].
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What is the angle of elevation from the ground to the top of a 45 -foot tree from 65 feet away?
Answer: The angle elevation is 34.6 9 degree.
Step-by-step explanation:
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