i need help to this homework

Answer: (4 x 3) - (2 + 9)

The correct numerical expression is:

(4 x 3) - (2 + 9)

After answering the provided question, we can conclude that As a result, equation the wrapper must have been dropped around 4.875 seconds ago.

An equation in mathematics is a statement that states the equality of two expressions. An equation is made up of two sides that are separated by an algebraic equation (=). For example, the argument "2x + 3 = 9" asserts that the phrase "2x + 3" equals the value "9". The purpose of equation solving is to determine the value or values of the variable(s) that will allow the equation to be true. Equations can be simple or complicated, regular or nonlinear, and include one or more elements. The variable x is raised to the second power in the equation "x2 + 2x - 3 = 0." Lines are utilised in many different areas of mathematics, such as algebra, calculus, and geometry.

a) Set f(x) to 450 and solve for x to find the amount of time since dropping the wrapper when it is 450 feet in the air:

-16x² - 2x + 600 = 450

b)

-16x² - 2x + 150 = 0

[tex]x = (-(-2) + \sqrt((-2)^2 - 4(-16)(150))) / (2(-16))\\x = (2 + \sqrt(4 + 9600)) / (-32)\\x = (2 + \sqrt(9604)) / (-32)\\x = (2 + 98) / (-32)\\x = -3.125\\ or\\ x = 4.875\\[/tex]

c) Because time cannot be negative and the candy wrapper cannot have been at a height of 450 feet before it was dropped, the solution that makes the most sense in the context of the circumstance is x = 4.875. As a result, the wrapper must have been dropped around 4.875 seconds ago.

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Answer:

30cm²

Step-by-step explanation:

If yu remove the triangle FED and replace it in place ABC, you will recive a rectangle of side a=AC=6cm and b=DC=5cm. And the area of rectangle is a*b.

Area=a*b=6cm*5cm=30cm²

Answer: d

≥

3/4

Step-by-step explanation:

2d+7.5d≥ 5.5d +3

9.5d≥ 5.5d +3

9.5d-5.5d ≥ 3

4d ≥ 3

***Divide 4 on both sides

d

≥

3/4

In a class, there are 18 girls and 14 boys. If the teacher selects two students at random to attend a party with the principal, the probability that the two students are the same sex is 0.49.

Therefore, the total number of students = 18 + 14 = 32

This can be calculated by using the combination formula: ⁿC₂ = n! / ((n - r)! r!).

Here, n = 32 (total number of students), and r = 2 (number of students that we have to select).

ⁿC₂ = 32C₂ ⇒ 32! / ((32 - 2)! 2!) ⇒ (32 × 31) / (2 × 1) ⇒ 496

The number of ways of selecting two girls = ¹⁸C₂ ⇒ 153

The number of ways of selecting two boys = 14C₂ ⇒ 91

Total number of ways of selecting two students of the same sex = 153 + 91 = 244

Probability of selecting two students of the same sex = (Number of ways of selecting two students of the same sex) / (Total number of ways of selecting two students)

⇒ 244 / 496 ⇒ 0.49

Therefore, the probability that the two students are the same sex is 0.49.

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They should be used carefully because they can potentially increase fuel consumption and engine damage.

The space or length separating two points or objects is measured as distance. It is used to define the distance between objects in space or their relative position in space, and it is a fundamental idea in mathematics and physics. The distance formula, which is based on the Pythagorean theorem, is typically used in mathematics to calculate distance. In a two-dimensional coordinate system, the distance between two locations is calculated as the square root of the sum of the squares of the disparities between their x and y coordinates.

given

While travelling at slower speeds, ascending hills, or travelling down or up steep inclines, lower gears are often employed. When driving, you might want to shift into a lower gear in the following circumstances:

Driving on ice or snow Using a lower gear can provide you more traction and help you keep control of the car when driving in slick conditions.

Driving on windy roads: Using a lower gear while driving on winding roads might help you keep a steady speed and prevent the car from accelerating too quickly.

In general, when the engine needs to work harder than usual, using lower ratios might provide you greater power and control.

They should be used carefully because they can potentially increase fuel consumption and engine damage.

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We can conclude by answering the provided question that As a result, Figure B has a capacity of approximately 226.19 cubic centimetres and a surface area of approximately 94.25 square centimetres.

The surface area of an object indicates the total volume filled by its surface. The surface area of a three-dimensional shape is the entire quantity of space that surrounds it. The surface area of a three-dimensional object refers to its total surface area. By adding the areas of each face, the surface area of a cuboid with six rectangular sides can be determined. As an alternative, you can use the following algorithm to identify the box's dimensions: 2lh + 2lw + 2hw = surface (SA). Surface area is a measurement of the total quantity of room occupied by the surface of a three-dimensional shape (a three-dimensional shape is a shape that has height, width, and depth).

For each figure, we will compute the volume and surface area individually.

Diagram A:

Figure A is a rectangle pyramid in form. It measures 10 centimetres long, 6 cm wide, and 4 cm tall.

Diagram B:

Figure B is a cylindrical in form. It has a radius of 3 centimetres and a height of 8 cm.

Image B volume = x radius2 x height = x 32 x 8 cm3 = 226.19 cubic centimetres

Figure B surface area = 2 x radius x height + 2 x radius2 = 2 x 3 cm x 8 cm + 2 x 32 cm2 = 94.25 square centimetres

As a result, Figure B has a capacity of approximately 226.19 cubic centimetres and a surface area of approximately 94.25 square centimetres.

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The answer is option B: 54,000,000/mL. The sperm concentration is 0.54 million per cubic centimeter, or 54 million per milliliter.

To calculate the sperm concentration using a Neubauer counting chamber, we can use the following formula:

Sperm concentration = (number of sperm counted ÷ number of counting squares) ÷ dilution factor

In this case, we have:

Number of sperm counted = 54

Number of counting squares = 5

Dilution factor = 1:20

First, we need to calculate the total volume of the diluted sperm sample that was loaded onto the counting chamber. To do this, we can use the following formula:

Total volume = volume of loaded sample ÷ dilution factor

Since the dilution factor is 1:20, this means that the volume of loaded sample is 1/20th of the total volume. The total volume depends on the depth of the chamber and is usually 0.1 mL (or 100 μL) for a standard Neubauer counting chamber. Therefore:

Total volume = 0.1 mL ÷ 20 = 0.005 mL

Next, we can calculate the sperm concentration using the formula above:

Sperm concentration = (54 ÷ 5) ÷ 1/20

Sperm concentration = 54 ÷ 5 × 20

Sperm concentration = 54 ÷ 100

Sperm concentration = 0.54 million/cc

Therefore, the answer is option B: 54,000,000/mL. The sperm concentration is 0.54 million per cubic centimeter, or 54 million per milliliter.

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Your question is incomplete, but probably the complete question is :

Using a 1:20 dilution and the 5 RBC counting squares of the Neubauer counting chamber, an average of 54 sperm is counted. The sperm concentration is:

A. 54,000/cc

B. 54,000,000/mL

C. 108,000/cc

D. 108,000,000/mL

Answer:

No you would not use all your money, you would have 9 bananas with $0.10 left.

Step-by-step explanation:

t = m(x)

substitute

3.25 = .35(x)

inverse operations (divide by .35 on both sides)

3.25/.35 = (x)

9(rounded to the nearest whole number) = x

9 is the number of bananas. Now we need to find the change.

9 * .35 = 3.15

3.25 - 3.15 = .10

You will have 9 bananas with 10 cents left.

The company caught approximately 1,461,880 fish over the first 13 years. We can calculate it in the following manner.

Since the number of fish caught by the company decreases by 4% each year, the number of fish caught in the second year will be 96% of the first year, and the number of fish caught in the third year will be 96% of the second year, and so on.

To find the total number of fish caught by the company over the first 13 years, we can use the following formula:

Total fish caught

[tex]= 130,000 + 0.96130,000 + 0.96^{2130,000} + ... + 0.96^{12*130,000}[/tex]

Using the formula for the sum of a geometric series, we can simplify this to:

Total fish caught = 130,000 * (1 - 0.96¹³)/(1 - 0.96)

Plugging in the values and solving for the total fish caught, we get:

Total fish caught = 130,000 * (1 - 0.96¹³)/(1 - 0.96) = 1,461,880

Therefore, the company caught approximately 1,461,880 fish over the first 13 years.

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The number of observation taken to obtain confidence interval of 50% is equal to 484.

Confidence interval for p = 50%

Use the formula for the confidence interval of a proportion to find the sample size n,

p ± z√(p×(1-p)/n) = (0.57, 0.63)

where z is the z-score corresponding to a 50% confidence interval, which is 0.674.

Midpoint of the interval is,

(p1 + p2) / 2

= (0.57 + 0.63) / 2

= 0.60

Rewrite the equation as,

0.60 ± 0.674√(0.60(1-0.60)/n) = (0.57, 0.63)

Simplifying this equation, we get,

⇒ 0.674√(0.60(1-0.60)/n) = 0.03/2

⇒ 0.674√(0.60(1-0.60)/n) = 0.015

Squaring both sides and solving for n, we get,

⇒n = 0.60×(1-0.60)×(0.674/0.015)^2

⇒n = 483.84

Rounding up to the nearest integer, the sample size is n = 484.

Therefore, n k equals 484 k, and 484 observations were taken to obtain the 50% confidence interval of (0.57, 0.63) for p.

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4x2/9

Both will result to 8/9

First, we need to find the coordinates of each vertex of triangle ABC. Let's assume that A is located at (a,b), B is located at (c,d), and C is located at (e,f). Since we know the measures of the angles, we can also determine the slopes of the lines connecting the vertices:

The slope of line AB is (d-b)/(c-a), which is equal to tan(55°).

The slope of line BC is (f-d)/(e-c), which is equal to tan(80°).

The slope of line AC is (f-b)/(e-a), which is equal to tan(55°-45°) = tan(10°).

Using these slopes, we can find the equations of the three lines and solve for the coordinates of the vertices:

Line AB: y-b = tan(55°)(x-a)

Line BC: y-d = tan(80°)(x-c)

Line AC: y-b = tan(10°)(x-a)

Solving these equations simultaneously, we get:

A = (b + (c-a)tan(55°), b + (c-a)tan(55°-45°))

B = (c + (f-d)/tan(80°), d + (f-d))

C = (e + (b-f)/tan(10°), f + (e-a)tan(10°))

Next, we need to apply the rotation and reflection to these vertices to find the corresponding vertices of triangle XYZ. The rotation by 90° counterclockwise about the origin transforms a point (x,y) into (-y,x), while the reflection across the line y=x transforms a point (x,y) into (y,x). So:

Vertex A of ABC is mapped to vertex X of XYZ: (a,b) → (-b,a) → (a,-b)

Vertex B of ABC is mapped to vertex Y of XYZ: (c,d) → (-d,c) → (c,d)

Vertex C of ABC is mapped to vertex Z of XYZ: (e,f) → (-f,e) → (e,f)

Now we need to find the measure of angle Y. Since we don't know the exact coordinates of the vertices of XYZ, we'll use the fact that the rotation by 90° counterclockwise about the origin preserves angles and the reflection across the line y=x changes the orientation of angles but not their measure. Therefore:

m∠Y = m∠ZOX, where O is the origin

m∠ZOX = 90° - m∠XOZ

m∠XOZ = m∠COA = 55° + 45° = 100°

Therefore, m∠Y = 90° - 100° = -10°, but since angles can't have negative measures, we add 360° to get m∠Y = 350°.

So the measure of angle Y in triangle XYZ is 350°.

Question 1

1/1

Triangle ABC

maps to triangle XYZ

by a rotation of 90∘

counterclockwise about the origin followed by a reflection across the line y=x.

In triangle ABC,

m∠A=45∘,

m∠B=55∘,

and m∠C=80∘.

What is the measure of ∠Y?

Enter your answer as the correct value, like this: 42

55 is the answer I'm not joking try it lol

Answer: 4x√5

Simplify the radical by breaking the radicand up into a product of known factors, assuming positive real numbers.

Answer:

Step-by-step explanation:

Answer:The most accurate inference from this boxplot is that: The visiting team had more variability in the number of shots taken.

Step-by-step explanation:

The box and whiskers plot is a way of presenting data that gives 5 major information about the distributionFrom the whiskers of the plot, one can read- The minimum value - The maximum value Then, from the boxplot, one can read- The Median, represented by the middle line of the boxplot.- The first Quartile or 25th percentile, represented by the lower end of the boxplot.- The third quartile or 75th percentile, represented by the upper end of the boxplot.Other variables that can be obtained from these five data points include- The range of the distribution (maximum value minus minimum value)- The interquartile range (a measure of variation, which is the difference between the third and first quartile of the distribution)For the two boxplots that the coach madeHome teamWhiskers range from 16 to 32Minimum value = 16maximum value = 32the box ranges from 20 to 23. A line divides the box at 22.First quartile = 20Third quartile = 23Median = 22IQR = 23 - 20 = 3For the visiting teamWhiskers range from 14 to 32Minimum value = 14maximum value = 32the box ranges from 16 to 24. A line divides the box at 18.First quartile = 16Third quartile = 24Median = 18IQR = 24 - 16 = 8Since the median only represents the midpoint of the distribution, one cannot conclude with certainty that home team took more shots than the visiting team, information on the mean would confirm that. A less controversial and evident inference is that the visiting team had more variability in their shots as their distribution has a higher Interquartile Range (IQR of 8 > 3) which is a direct measure of variation for distributions.

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a) The distance of P from the base of the building is 168.0 m.

b) The height of the building is 43.8 m.

c) The length of the flagstaff is 25.8 m.

The given information is used to solve the three parts of the problem. First, to calculate the distance of P from the base of the building, the tangent of the angle of elevation of the top of the flagstaff, 32°, is used. The tangent of 32° is 0.6, and this is equal to the ratio of the height of the building and the distance from P to the base of the building. This gives the equation 0.6 = 43.8/x, where x is the distance of P from the base of the building. Solving for x gives x = 168.0 m.

Second, to calculate the height of the building, the tangent of the angle of elevation of the bottom of the flagstaff, 29°, is used. The tangent of 29° is 0.546, and this is equal to the ratio of the height of the building and the distance from P to the base of the building. This gives the equation 0.546 = h/168.0, where h is the height of the building. Solving for h gives h = 43.8 m.

Third, to calculate the length of the flagstaff, the tangent of the angle of elevation of the top of the flagstaff, 38°, is used. The tangent of 38° is 0.717, and this is equal to the ratio of the length of the flagstaff and the distance from Q to the base of the building. This gives the equation 0.717 = x/93.0, where x is the length of the flagstaff. Solving for x gives x = 25.8 m.

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The probability that shares of Acme and Best will both increase in value over the next month is 0.2 (20%). This is calculated by multiplying the individual probabilities of each stock increasing in value (50% x 40%)

1. Calculate the individual probability of Acme increasing in value: 50%

2. Calculate the individual probability of Best increasing in value: 40%

3. Multiply the two individual probabilities together to calculate the probability that both stocks will increase in value: 50% x 40% = 0.2 (20%)

The probability that shares of Acme and Best will both increase in value over the next month is 0.2 (20%). This is calculated by multiplying the individual probabilities of each stock increasing in value (50% x 40%)

The complete question is :

The probability that shares of acme will increase in value over the next month is 50% and the probability that shares of acme and shares of best will both increase in value over the next month is 40%.What is the probability that shares of Acme and shares of Best will both increase in value over the next month?

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A toy shop purchases 125 identical stuffed animals for a total cost of $321.50 and sells them for $7 each. The percent markup is 171.9%.

The total cost of purchasing 125 identical stuffed animals is $321.50.

To find the cost per stuffed animal, we divide the total cost by the number of stuffed animals:

Cost per stuffed animal = Total cost / Number of stuffed animals

Cost per stuffed animal = $321.50 / 125

Cost per stuffed animal = $2.572

The toy shop sells each stuffed animal for $7.

To find the markup, we need to calculate the difference between the selling price and the cost price, and then express that difference as a percentage of the cost price:

[tex]Markup = (Selling price - Cost price) / Cost price * 100%[/tex]

Markup = ($7 - $2.572) / $2.572 x 100%

Markup = $4.428 / $2.572 x 100%

Markup = 1.719 x 100%

Markup = 171.9%

Therefore, the percent markup is 171.9%.

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Answer:

To find the perimeter of the shaded shape, we need to determine the length of the sides of the shaded shape.

First, we need to find the area of the two small rectangles that were removed from the large rectangle:

Area of small rectangle 1: length x width = 4 cm x 3 cm = 12 cm²

Area of small rectangle 2: length x width = 4 cm x 2 cm = 8 cm²

The total area of small rectangles: 12 cm² + 8 cm² = 20 cm²

Now we can find the area of the shaded shape by subtracting the area of the small rectangles from the area of the large rectangle:

Area of large rectangle: length x width = 10 cm x 8 cm = 80 cm²

Area of shaded shape: 80 cm² - 20 cm² = 60 cm²

Since the shaded shape is rectangular, we can find the length and width by dividing the area by a factor pair:

60 cm² ÷ 6 cm = 10 cm

60 cm² ÷ 10 cm = 6 cm

So the shaded shape has sides of 6 cm and 10 cm.

Finally, we can find the perimeter of the shaded shape by adding up the lengths of all four sides:

Perimeter = 6 cm + 10 cm + 6 cm + 10 cm = 32 cm

Therefore, the perimeter of the shaded shape is 32 cm.

Step-by-step explanation:

Answer:

59

Step-by-step explanation:

60 + 61 + m<4 = 180

m<4 = 59°

Answer:

Let's assume the width of the door is x inches. Then, according to the problem, the length of the door is 48 inches longer than the width, which means the length is x+48 inches.

The area of the door is given as 3024 square inches, so we can set up an equation:

Area = width x length

3024 = x(x+48)

Simplifying the equation, we get:

x^2 + 48x - 3024 = 0

Now we can solve for x using the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / 2a

where a = 1, b = 48, and c = -3024

x = (-48 ± √(48^2 - 4(1)(-3024))) / 2(1)

x = (-48 ± √(2304 + 12096)) / 2

x = (-48 ± √14400) / 2

We take the positive root since the width of a door cannot be negative:

x = (-48 + 120) / 2

x = 36

Therefore, the width of the door is 36 inches.

Step-by-step explanation:

Answer:y = (1/2)x + 4

Step-by-step explanation:

The equation of the line that passes through the points (-6, 1) and (6, 7) can be found using the slope-intercept form of a line. The slope m is calculated as (y2 - y1)/(x2 - x1), where (x1,y1) and (x2,y2) are the coordinates of the two points. Plugging in the values for these points gives us a slope of m = (7-1)/(6-(-6)) = 1/2.

Now that we have the slope, we can use point-slope form to find the equation of the line: y - y1 = m(x - x1). Substituting one of our points and our calculated slope into this equation gives us y - 1 = (1/2)(x + 6). Simplifying this expression gives us y = (1/2)x + 4, which is the equation of our line in slope-intercept form.

So, an equation for this line is y = (1/2)x + 4.

Answer:

y = [tex]\frac{1}{2}[/tex] x + 4

Step-by-step explanation:

the equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

calculate m using the slope formula

m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]

with (x₁, y₁ ) = (- 6, 1 ) and (x₂, y₂ ) = (6, 7 )

m = [tex]\frac{7-1}{6-(-6)}[/tex] = [tex]\frac{6}{6+6}[/tex] = [tex]\frac{6}{12}[/tex] = [tex]\frac{1}{2}[/tex] , then

y = [tex]\frac{1}{2}[/tex] x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (6, 7 )

7 = [tex]\frac{1}{2}[/tex] (6) + c = 3 + c ( subtract 3 from both sides )

4 = c

y = [tex]\frac{1}{2}[/tex] x + 4 ← equation of line

As a result, the icicle has a volume of about 4.19 cubic inches.

. The formula V = (1/3)r2h, where r is the radius of the base and h is the height of the cone, determines the volume of a cone.

The distance between a circle's center to any other point on the circle is known as the radius. It is frequently represented by the letter "r."

The radius of a sphere, in this example, is the separation between any two points on its surface from the sphere's centre.

In this instance, the icicle is shaped like a cone with a 1 in. radius and a 12 in. height.

As a result, the icicle's volume is:

V = (1/3)π(1 in.)²(12 in.)

V ≈ 4.19 cubic inches

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Whatn the 5 highest is removed then standard deviation will decrease. (C)

The standard deviation is a measure of how spread out numbers are from the mean. Removing the 5 highest scores from the distribution of 20 scores will cause the numbers to become more concentrated around the mean, thus decreasing the standard deviation.

This is because the 5 highest scores are further away from the mean than the other numbers and by removing them, the average distance between the numbers and the mean decreases.

Mathematically, the formula for standard deviation is the square root of the sum of squared deviations from the mean divided by the number of scores minus 1.

When the 5 highest scores are removed, this means the sum of squared deviations from the mean is reduced, and since the number of scores is also reduced, the overall standard deviation value decreases.(C)

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If all else remains constant and the values of two variables move in the same direction, it indicates a positive correlation.

  Correlation is a statistical measure that expresses the relationship between two variables. The correlation coefficient, which ranges from -1 to +1, is used to quantify the correlation.

 A positive correlation is when the values of the variables move in the same direction. A correlation of +1 indicates that the variables are perfectly positively correlated, implying that as one variable increases, the other also increases.

 A correlation of -1 indicates that the variables are perfectly negatively correlated, implying that as one variable increases, the other decreases. A correlation of zero indicates that there is no correlation between the variables.

   Hence a positive correlation exists when the values of two variables move in the same direction while all other factors remain constant.

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Answer:

196

Step-by-step explanation:

The predicted population of the city in the year 2030 is 5,780 person.

In Mathematics, a population that increases at a specific period of time represent an exponential growth. This ultimately implies that, a mathematical model for any population that increases by r percent per unit of time is an exponential function of this form:

P(t) = I(1 + r)^t

Where:

Years = 2030 - 2010 = 20 years.

By substituting given parameters, we have the following:

[tex]P(t) = I(1 + r)^t\\\\P(t) = 3200(1 + 3/100)^{20}\\\\P(t) = 3200(1 + 0.03)^{20}[/tex]

P(t) = 5,779.56 ≈ 5,780 person.

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Check the picture below.