Dan had 50% fewer stickers than Jeff. After Jeff gave 20 of his stickers to Dan, Dan had 40% fewer stickers than Jeff. Dan had 320 stickers first.
Dan had 50% fewer stickers than Jeff.
After Jeff gave 20 of his stickers to Dan, Dan had 40% fewer stickers than Jeff (had after he gave away 20 of his stickers).
How many stickers did Dan have at first?
The total number of stickers that Jeff had is denoted by J, and the total number of stickers that Dan had is denoted by D.
In order to solve the question, let us first represent the given data mathematically:
J = 1.5D; D+20 = 0.6(J-20)
We have 2 equations and 2 unknowns, J and D.
We can solve these equations using simultaneous linear equations.
Substitute the first equation in the second equation:
D+20=0.6(J-20)
⇒ D+20=0.6J-12
⇒ D=0.6J-32
Now substitute the value of D in the first equation:
J=1.5D
⇒ J=1.5(0.6J-32)
⇒ J=0.9J-48.
Therefore, J=480
The total number of stickers that Jeff had initially was 480.
Now, to calculate the total number of stickers that Dan had, we can use the equation
J=1.5D:J=1.5D
⇒ 480=1.5D
⇒ D=320
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If a musician uses his credit card to pay for a new violin that cost 2900 and does not pay on it until the second month what will the 3. 35% monthly interest charge be at the end of the first month show your work and how you got your answer
The formula to calculate interest charge when the musician does not make any payments for one month is Interest = Principal * Rate * Time. Using the given values, the interest charge for the first month is $97.15, making the total owed amount at the end of the first month $2,997.15.
If the musician does not make any payments for one month, the amount owed will accumulate interest. To calculate the interest charge, we can use the following formula:
Interest = Principal * Rate * Time
where the principal is the initial amount owed, the rate is the monthly interest rate as a decimal, and the time is the time period in months.
In this case, the principal is $2,900, the monthly interest rate is 3.35% expressed as a decimal (0.0335), and the time is one month.
So, the interest charge for the first month will be:
Interest = $2,900 * 0.0335 * 1
Interest = $97.15
Therefore, at the end of the first month, the musician will owe the initial balance of $2,900 plus the interest charge of $97.15, for a total of $2,997.15.
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The city manager has received approval to add a new fountain to the main park. He uses a coordinate plane to map the existing fountain, represented by rectangle TRUV.
The new fountain will be a reflection of the existing fountain across the y-axis. Which statement about the new fountain, identified as T'R'U'V', is true?
The statement that would be true of the reflection of the existing fountain across the y - axis is B. There are two sets of parallel lines: T'V' || R'U' and T'R' || V'U'
How to reflect across the y - axis ?A reflection of a shape would lead to a congruent shape in another part of the graph. This means that the new shape would have the same set of parallel lines as the original.
The quadrilateral TRUV had parallel line sets of TV || RU and TR || VU so the reflected figure would have congruent parallel lines at T'V' || R'U' and T'R' || V'U'.
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The options for the question are:
There are two sets of parallel lines: TV VU and TR || R'U
There are two sets of parallel lines: T'V' || R'U' and T'R' || V'U'
The points T. R, U, and V have these coordinates: (-2,-7),(6,7),(-2,-4)
.and (-6,-4).
The points T. R. U, and V have these coordinates: (2,-7), (6,7),(2,-4) and (6,-4)
The pseudoinverse of the null (all zero) vector is the transposed null vector. The pseudoinverse of a non-nullvector is the conjugate transposed vector divided by its squared magnitude:x+ = { 0,. if x = 0;x-1 otherwise.
What is a pseudoinverse?
The pseudoinverse of the null (all zero) vector is indeed the transposed null vector. This is because the null vector has no direction or magnitude, so when we calculate its pseudoinverse, we are essentially looking for a vector that when multiplied with the null vector gives us the identity matrix. Since there is no such vector, the pseudoinverse is simply the transposed null vector. This is denoted by x+ and is defined as follows:
x+ = {0, if x = 0; x*-/(||x||^2), otherwise.
Here, x* denotes the conjugate transpose of x, and ||x||^2 represents the squared magnitude of x. Essentially, we are finding a vector that when multiplied with x gives us the identity matrix (or as close to it as possible). This vector is the pseudoinverse, and it is computed using the formula above.
So in summary, the pseudoinverse of the null vector is the transposed null vector, while the pseudoinverse of a non-null vector is the conjugate transposed vector divided by its squared magnitude.
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Shapera has three sources of income. she earns $15 for each lawn she mows. She earns $7 per hour working part-time at a pet store. She earns $20 each day she delivers newspapers.
Part A: Write an expression that represents her total earnings.
Part B: In the six weeks, Shapera mowed 7 lawns, worked 36 hours at the pet store, and delivered newspapers 7 days. Did she make enough to buy the computer? Explain your answer
(Please answer as fast as possible!!)
Answer:
Step-by-step explanation:
Mowed lawns 15 times 7 = 105 Working at pet store 7 times 36 = 252 Delivers newspapers 20 times 7 = 140 105+252+140= 497Find the area of the following shapes. Please help
A=?cm2
The shape is an identical parallelogram and the area is equal to 30 square centimeters.
Area of parallelogramIn calculating for the area of parallelogram, the base is multiplied by the height, as the same way for calculating the area of a rectangle.
we shall calculate for the area of the shape by evaluating the area of the one parallelogram and then multiply the result by two as follows:
area of one identical parallelogram = 5 cm × 3 cm
area of one identical parallelogram = 15 cm²
area of identical parallelogram shape = 2 × 15 cm²
area of identical parallelogram shape = 30 cm²
Therefore, the area for the identical parallelogram shape is equal to 30 square centimetres.
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HELP NOW!
Without graphing, identify the key features of the given function.
-vertex
-axis of symmetry
-direction of opening
-number of x-intercepts
-compression/expansion
[tex]f(x)=2(x-3)^2+5[/tex]
Explain your answers on how you found each answer.
The key features of the given function include the following:
Vertex = (3, 5)
Axis of symmetry = 3.
Direction of opening: upward.
Number of x-intercepts = 0.
Expansion.
What is the vertex form of a quadratic equation?In this exercise, you are required to determine the vertex form of a quadratic function h(x) that is written in standard form. Mathematically, the vertex form of a quadratic equation is given by this formula:
y = a(x - h)² + k
Where:
h and k represents the vertex of the graph.a represents the leading coefficient.Based on the information provided about this quadratic function, we can reasonably infer and logically deduce that its vertex can be determined as follows:
y = a(x - h)² + k
f(x) = 2(x - 3)² + 5
Vertex, (h, k) = (3, 5)
Axis of symmetry, Xmax = -b/2a = -(-6)/2(1) = 6/2 = 3.
In conclusion, the function does not have an x-intercept and it represents an expansion because the scale factor is greater than one (1) i.e k = 2.
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If g(x) = 1 – 2x + 3x2, find the average rate of change of the function as x varies from 2 to 5
The average rate of change of the function as x varies from 2 to 5 is 22.
Given function: g(x) = 1 – 2x + [tex]3x^2[/tex]
To find the average rate of change of the function as x varies from 2 to 5.
Solution: We are given a function: g(x) = 1 – 2x + [tex]3x^2[/tex]
The average rate of change of the function as x varies from a to b is given by:
Average rate of change = f(b) - f(a) / b - a
Let a = 2 and b = 5
We have to find the average rate of change of g(x) as x varies from 2 to 5.
So, the average rate of change of g(x) is given by:
Average rate of change = g(5) - g(2) / 5 - 2
= [1 - 2(5) + 3([tex]5^2[/tex])] - [1 - 2(2) + 3([tex]2^2[/tex])] / 3
= [1 - 10 + 75] - [1 - 4 + 12] / 3= 66 / 3= 22
Therefore, the average rate of change of the function as x varies from 2 to 5 is 22.
An average rate of change is the amount that the function changes on average over a specified interval.
The formula for average rate of change is given as the change in the function value divided by the change in x value for two distinct points on the function.
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Parker Paint has just created a new color, Sunset Orange, made by mixing 3 parts of Fire Red with 5 parts of Brilliant Yellow. A graph to help customers decide how much paint they need is hanging in the store. Use the point shown from the graph to help you decide how much Fire Red paint is needed to paint one 8 foot by 10 foot wall.
To paint an 8 foot by 10 foot wall with Sunset Orange, one needs 48 parts of Fire Red and 80 parts of Brilliant Yellow.Using the graph, we can calculate that for every 5 parts of Brilliant Yellow, 3 parts of Fire Red is needed.
Using the graph, we can calculate that for every 5 parts of Brilliant Yellow, 3 parts of Fire Red is needed. Since we need to paint an 8 foot by 10 foot wall, we need 80 square feet of paint. To calculate how much Fire Red is needed, we can use the equation: 3 parts of Fire Red = 5 parts of Brilliant Yellow. We can rearrange this equation to read: 5 parts of Brilliant Yellow = 3 parts of Fire Red. To get the amount of Fire Red required to paint the wall, we can multiply 80 (the square footage of the wall) by 3 and divide it by 5, giving us a total of 48 parts of Fire Red.
To paint an 8 foot by 10 foot wall with Sunset Orange, one needs 48 parts of Fire Red and 80 parts of Brilliant Yellow.
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a political candidate has asked you to conduct a poll to determine what percentage of people support him. if the candidate only wants a 3% margin of error at a 95% confidence level, what size of sample is needed? when finding the z-value, round it to four decimal places.
A sample size of 1068 is needed with a 95% confidence level and a 3% margin of error to estimate the proportion of people who support a political candidate.
To determine the sample size needed to estimate the percentage of people who support the political candidate with a 3% margin of error at a 95% confidence level, we can use the formula:
n = (z^2 * p * (1 - p)) / (E^2)
where n is the sample size, z is the z-value corresponding to the desired confidence level (95% confidence level corresponds to z = 1.96), p is the estimated proportion of the population that supports the candidate (we can use 0.5 as a conservative estimate), E is the desired margin of error (3% or 0.03)
Substituting the values into the formula, we get:
n = (1.96^2 * 0.5 * (1 - 0.5)) / (0.03^2) = 1067.11
Rounding up to the nearest integer, we need a sample size of 1068 to estimate the percentage of people who support the political candidate with a 3% margin of error at a 95% confidence level.
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Question 4 In which circuit represented below are meters properly connected to measure the current through resistor R1 and the potential difference across R2? A) LWA OAA OB.B OCC ODD
In Circuit B, the ammeter is connected in series with resistor R1 and the voltmeter is connected in parallel with resistor R2.
Therefore, the circuit is correctly setup to measure the desired quantities.
The correct circuit for measuring the current through resistor R1 and the potential difference across R2 is Circuit B. Circuit B is formatted with an ammeter measuring the current through R1 and a voltmeter measuring the potential difference across R2.
An ammeter is used to measure current and should be connected in series with the component it is measuring; whereas a voltmeter is used to measure potential difference and should be connected in parallel with the component it is measuring.
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Write the equation y - 6 = -5(x + 1) in
slope-intercept form.
answer - y = -5x + 1
How do I solve this?
Answer:
150 handshakes
Step-by-step explanation:
50+50=100 Since the girls shook ONCE to a boy and a girl, we would multiply 100 twice, then add another 50.
in a recent survey of 619 salinas residents, 437 stated they experienced significant traffic delays within the last month. if one of the 619 residents is selected at random, what is the probability they have experienced delays?
If one of the 619 residents is selected at random, the probability they have experienced delays is 70.6%.
To find the probability that a randomly selected Salinas resident has experienced significant traffic delays within the last month, we need to use the formula for probability:
Probability = Number of favorable outcomes / Total number of outcomes
In this case, the favorable outcome is the number of residents who have experienced significant traffic delays, which is 437. The total number of outcomes is the total number of residents surveyed, which is 619. Therefore, the probability is:
Probability = 437 / 619 ≈ 0.706
This means that there is a 70.6% chance that a randomly selected Salinas resident has experienced significant traffic delays within the last month, based on the given survey results.
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10. Which graph shows the solution to the inequality <-6?
The value of y varies directly with x
The calculated value of y when x is -4 is -10 given that the variation is a direct variation
Calculating the value of y when x is -4Direct variation is a mathematical concept that describes the relationship between two variables that change in proportion to each other.
More formally, two variables x and y are said to vary directly if their ratio is constant. This can be expressed mathematically as:
y = kx
So, we have
20 = -8k
This gives
k = -2.5
This means that
y = -2.5x
When the value of x is -4 we have
y = -2.5 * -4
Evaluate
y = 10
Hence, the value of y when x is -4 is -10
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Benzoic acid is used to determine the heat capacity of bomb calorimeters because it can be obtained in pure form and its energy of combustion is known very accurately (-26.43 kJ/g).
Determine the calorimeter constant of the calorimeter that had a temperature increase of 9.199 degrees Celsius when 3.500 g of benzoic acid was used.
Benzoic acid is used to determine the heat capacity of bomb calorimeters because it can be obtained in pure form and its energy of combustion is known very accurately (-26.43 kJ/g).
The calorimeter constant is -2873.5.
Determine the calorimeter constant of the calorimeter that had a temperature increase of 9.199 degrees Celsius when 3.500 g of benzoic acid was used.To determine the calorimeter constant, follow these steps:
Explanation:
1. Calculate the energy released by the benzoic acid combustion: Multiply the mass of benzoic acid by its energy of combustion.
Energy released = mass × energy of combustion
Energy released = 3.500 g × -26.43 kJ/g = -92.505 kJ
2. Convert the temperature increase to a change in energy: Multiply the temperature increase by the mass of benzoic acid.
ΔEnergy = temperature increase × mass of benzoic acid
ΔEnergy = 9.199°C × 3.500 g = 32.1965 J
3. Determine the calorimeter constant: Divide the energy released by the change in energy.
Calorimeter constant = Energy released / ΔEnergy
Calorimeter constant = -92.505 kJ / 32.1965 J
Note: We need to convert the units to be consistent, either to J or kJ.
1 kJ = 1000 J, so -92.505 kJ = -92505 J.
Calorimeter constant = -92505 J / 32.1965 J = -2873.5
The calorimeter constant is -2873.5.
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Triangle 1 and triangle 2 are similar right triangles formed from a ladder leaning against a building.
Determine the distance from the bottom of the building to the point where the ladder is touching the building for triangle 2.
4 feet
7 feet
9 feet
14 feet
The distance from the bottom of the building to the point where the ladder is touching the building for Triangle 2 is 14 feet.
What is triangle?
A triangle is a polygon with three sides and three angles. It is one of the most basic geometric shapes and is often used in geometry, trigonometry, and other branches of mathematics.
Since Triangle 1 and Triangle 2 are similar right triangles formed from the same ladder leaning against the same building, their corresponding sides are proportional to each other.
Let's use the concept of similarity and proportions to solve for the unknown distance in Triangle 2. We can set up the following proportion based on the corresponding sides of the two triangles:
(vertical leg of Triangle 1) : (horizontal leg of Triangle 1) = (vertical leg of Triangle 2) : (horizontal leg of Triangle 2)
We know that in Triangle 1:
the length of the hypotenuse (the ladder) is 16 feet
the length of the horizontal leg (the distance along the ground) is 8 feet
the length of the vertical leg (the distance from the bottom of the building to the point where the ladder is touching the building) is 16 feet
Using the Pythagorean Theorem, we can solve for the length of the vertical leg of Triangle 2:
(vertical leg of Triangle 1) : (horizontal leg of Triangle 1) = (vertical leg of Triangle 2) : (horizontal leg of Triangle 2)
16 : 8 = (vertical leg of Triangle 2) : 7
Simplifying the proportion, we get:
2 : 1 = (vertical leg of Triangle 2) : 7
To solve for the vertical leg of Triangle 2, we can multiply both sides of the proportion by 7:
2 * 7 : 1 * 7 = (vertical leg of Triangle 2)
14 : 1 = (vertical leg of Triangle 2)
Therefore, the distance from the bottom of the building to the point where the ladder is touching the building for Triangle 2 is 14 feet.
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What is the value of 2(÷)3+if x = 72, y = 24, and z=12?
the value of the expression 2 ÷ 3 + (x / y) - z, where x = 72, y = 24, and
z = 12, is approximately -8.33.
However, assuming that the intended expression is 2 ÷ 3, we can evaluate it using the rules of arithmetic. Division is performed before addition, so the expression can be rewritten as:
2 ÷ 3 + (x / y) - z
Substituting the given values of x, y, and z, we get:
2 ÷ 3 + (72 / 24) - 12
To evaluate this expression, we need to perform the division first:
2 ÷ 3 + 3 - 12
Next, we can simplify by combining like terms:
2 ÷ 3 - 9
To evaluate this expression, we need to perform the division first:
0.666666... - 9
Finally, we can simplify by subtracting:
-8.333333...
Therefore, the value of the expression 2 ÷ 3 + (x / y) - z, where x = 72, y = 24, and z = 12, is approximately -8.33.
It's important to note that if the intended expression was not 2 ÷ 3, the answer may be different. Additionally, it's important to be clear and precise when writing mathematical expressions to avoid ambiguity and confusion.
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How will the product of 7 x
Choose 1 answer:
64
5
compare to 7, and why?
It will be less because we are multiplying 7 by a fraction that is less
than 1.
It will be equal because we are multiplying 7 by a fraction that is
equal to 1.
It will be greater because we are multiplying 7 by a fraction that is
greater than 1.
According to the question the product of 7 x 5 will be greater than 7 from multiplication.
Explain Multiplication?Multiplication in mathematics is the addition of equal groups. As we proliferate, the quantity of items in the group increases. The product as well as the two elements are part of a multiplication issue. 6 and 9 are factors in the multiplication equation 6 9 = 54, and 54 is the result.
The product of 7 x 5 by multiplying with each other we can get 35
The number being multiplied with 7 is greater than 1 so the product will also be greater than 7.
The product of 7 x 5 will be greater than 7 because we are multiplying 7 by a number greater than 1.
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2. The function f gives the dollar value of a bond t years after the
bond was purchased. The graph of Jis shown.
What is f(0)? What does it mean in this situation?
b. What is f(4.5)? What does it mean in this situation?
c. When is f(t) = 1500? What does this mean in this
situation?
The function f a. f(0) represents the bonds after 0 years. That is the immediate value of bond in dollars at 0 year. b. f(4.5) represents the value of the bond 4.5 years later.
What does a mathematical function mean?A function in mathematics is a rule that designates a certain output value for each input value. Each input from the domain has precisely one output in the range, forming a relationship between two sets known as the domain and the range. The letter f(x), where x is the input variable and f(x) is the output variable, is a common way to represent a function. The output variable is specified by the function's rule, but the input variable can accept any value from the function's domain.
For the given graph of the function:
a. f(0) represents the bonds after 0 years. That is the immediate value of bond in dollars at 0 year.
b. f(4.5) represents the value of the bond 4.5 years later.
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the probability that no cars will pass by a section in an hour is 0.4 (modelled as a poisson process. further, no car passed by in the last 2 hours. what is the probability that you have to wait at least 1 more hour (after the 2 hours) for the next car?
The probability of having to wait at least 1 more hour for the next car is 0.631 or approximately 63.1%.
The given problem can be solved using the Poisson distribution. Let [tex]$\lambda$[/tex] be the average rate of cars passing through the section per hour. Then, since the probability of no cars passing in one hour is 0.4, we have:
[tex]$P(X=0)=\frac{\lambda^0e^{-\lambda}}{0!}=0.4$[/tex]Solving for [tex]$\lambda$[/tex], we get [tex]$\lambda= -ln(0.4) \approx 0.916$[/tex]. Therefore, the probability of no cars passing in three hours (two hours have already passed) is:
[tex]$P(X=0 \text{ in } 3 \text{ hours})=\frac{(0.916\cdot3)^0e^{-0.916\cdot3}}{0!} \approx 0.148$[/tex]The probability of waiting at least 1 more hour for the next car is the same as the probability of having no cars pass in the next hour, given that no cars have passed in the last 2 hours. This can be calculated using the conditional Poisson distribution:
[tex]$P(X=0 \text{ in } 1 \text{ hour} | X=0 \text{ in } 3 \text{ hours}) = \frac{P(X=0 \text{ in } 1 \text{ hour and } X=0 \text{ in } 3 \text{ hours})}{P(X=0 \text{ in } 3 \text{ hours})}$[/tex][tex]$= \frac{\frac{(0.916\cdot1)^0e^{-0.916\cdot1}}{0!}\cdot \frac{(0.916\cdot2)^0e^{-0.916\cdot2}}{0!}}{0.148} \approx 0.631$[/tex]
Therefore, the probability of having to wait at least 1 more hour for the next car is 0.631 or approximately 63.1%.
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Some of the dimensions of a house are shown below.
Calculate the length u.
Give your answer in metres to 2 d.p.
56°
1.65 m
u
43°
Not drawn accurately
Using trigonometric relations we can see that u = 4.28m
How to find the length of u?First we can find the length of the shared side using the trigonometric relation:
tan(56°) = x/1.65m
1.65m*tan(56°) = x
2.45m = x
Then the length of the bottom side of the right triangle in the right side is iven by:
tan(43°) = 2.45m/y
Solving for y:
y = 2.45m/tan(43°)
y = 2.63m
Then the length of u is:
u = 1.65m + 2.63m = 4.28m
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How many consecutive zeros are there at the end of 6^8 x 10^3 x 8^2 x 25^5 ?
Answer:
13
Step-by-step explanation:
(6^8)(10^3)(8^2)(25^5)=1049760000000000000
so 13 zeros after 104976
find the solution of the system of equations 2x + 6y = -16 -6x - 3y = -27 i need a answer neoowww
The solution of the system of equations are (7,-5).
Define about the system of equations?A set or group of equations that you solve all at once is referred to as a "system" of equations. The fundamental linear system comprises two equations as well as two variables. Linear equations (those that graph simply straight lines) are easier to understand than non-linear ones.The system of equations:
2x + 6y = -16 and -6x - 3y = -27
2x + 6y = -16
Divide by 2
x + 3y = -8 ..eq 1
-6x - 3y = -27 ..eq 2
Use elimination method.
Add eq 1 from 2
x + 3y -6x -3y = -8 - 27
-5x = -35
x = 7
3y = -8 - 7
y = -15/3
y = -5
Thus, the solution of the system of equations are (7, -5).
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if my grade is 88 but i have a test that counts for 25 percent of my total grade and i get an 80 what will my grade be
If your grade is 88 but you have a test that counts for 25 percent of your total grade and you get an 80, your grade will be 86.
Test scores are an essential aspect of an educational system. Teachers use them to evaluate how well students have grasped concepts or learned material from a class or course. They help in establishing the academic strength and weaknesses of the student.
The test score you got is 80, which makes 25% of the total grade you can have for this course. This means that 0.25*80 = 20 marks will be added to your final grade. Your previous grade was 88, which will not be counted with the test marks.
Hence the marks you will have for the final grade will be 88 + 20 = 108. Divide this number by 1.25 (as 25% is equivalent to 0.25), which results in 86.4. You can round it off to the nearest integer, which is 86.
Therefore, your final grade will be 86.
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PLEASE HELP MEEEEEEEEEEE!
What is the measure of the unknown angle?
A straight angle divided into a fifty-eight-degree angle and an unknown angle.
100°
112°
120°
122°
Therefore , the solution of the given problem of angles comes out to be the right response is option d 122°.
An angle meaning is what?Using Cartesian coordinates, the top and bottom walls divide the circular lines that make up a skew's ends. There is a chance that two poles will meet at a junction point. Angle is another outcome of two things interacting. They mirror dihedral forms the most. A two-dimensional curve can be created by arranging two line beams in various ways at their extremities.
Here,
180 degrees is the length of a straight circle. It has been split into a 58-degree angle and an unidentified angle, as far as we are aware. So that we can determine the size of the undetermined angle, let's use subtraction:
=> Angle unknown = 180 degrees minus 58 degrees
=> Angle unknown = 122 degrees
As a result, the undetermined angle is 122° in size.
The right response is (d) 122°.
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What is √45 rounded to the nearest whole number
Answer:
3√5
Step-by-step explanation:
Need help it’s due tomorrow for test corrections!!
We know that the temperature was 56°F at midnight, so we can plot the point (24, 56)
What is graph ?
Graph can be defined as visual representation of given data using the ordered pairs.
To graph Elroy's data, we can use the x-axis to represent the time of day in hours and the y-axis to represent the temperature in degrees Fahrenheit.
First, we can plot the point (6, 50) to represent the temperature at 6am.
Next, we can use the information that the temperature rose 3° per hour for the next 4 hours. This means that at 10am, the temperature would be 50 + 3(4) = 62°F. We can plot this point at (10, 62). Similarly, we can find the temperature at 7am, 8am, and 9am using the same formula and plot those points as well.
Then, we can use the information that the temperature rose 2° per hour for the next 6 hours. This means that at 4pm, the temperature would be 62 + 2(6) = 74°F. We can plot this point at (16, 74). Similarly, we can find the temperature at 11am, 12pm, 1pm, 2pm, and 3pm using the same formula and plot those points as well.
The temperature then stayed steady until 6pm, so we can draw a horizontal line at y = 74 from 4pm to 6pm.
For the next 2 hours, the temperature dropped 1° per hour. This means that at 8pm, the temperature would be 74 - 2 = 72°F. We can plot this point at (20, 72). Similarly, we can find the temperature at 7pm using the same formula and plot that point as well.
Therefore, we know that the temperature was 56°F at midnight, so we can plot the point (24, 56).
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two cyclists, 48 mi apart, start riding towards each other at the same time. one cycles twice as fast as the other. if they meet 1 hr later, at what average speed is each cyclist traveling?
The slower cyclist travels at a speed of 16 miles per hour, while the faster cyclist travels at twice the speed, which is 32 miles per hour.
Let's assume that the slower cyclist's speed is x mi/h, then the faster cyclist's speed is 2x mi/h.
Since they are riding towards each other, their relative speed is the sum of their speeds, which is 3x mi/h.
They travel a total distance of 48 mi in 1 hour, so we can use the formula:
distance = rate x time
48 = 3x x 1
Solving for x, we get:
x = 16
Therefore, the slower cyclist's speed is 16 mi/h and the faster cyclist's speed is 32 mi/h.
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A ball is thrown from an initial height of 3 meters with an initial upward velocity of 30(m)/(s). The ball's height h (in meters) after t seconds is given by the following.
h=3+30t-5t^(2)
Find all values of t for which the ball's height is 13 meters.
Answer: -451
Step-by-step explanation:
so, the height we are trying to find is 13 meters.
13=3+30t-5t^2
so, we can go ahead and pull that number in.
now we have to subtract the 3 to try and get as much as possible over on the other side to find t.
10=30t-5t^2
Step-by-step explanation:
h(t) = 3 + 30t - 5t²
the height is set to 13 meters.
since the ball will go up and then come back down again, we expect 2 points of time, when the ball is at 13 meters high. if any at all, by the way (keep that in mind for similar questions, the object might not even reach a certain height).
13 = 3 + 30t - 5t²
10 = 30t - 5t²
2 = 6t - t²
0 = -t² + 6t - 2
the general solution to a quadratic equation
ax² + bx + c = 0
is
x = (-b ±sqrt(b² - 4ac))/(2a)
in our case
x = t
a = -1
b = 6
c = -2
t = (-6 ±sqrt(6² - 4×-1×-2))/(2×-1) =
= (-6 ±sqrt(36 - 8))/-2 = (-6 ±sqrt(28))/-2 =
= (-6 ±sqrt(4×7))/-2 = (-6 ±2×sqrt(7))/-2 =
= 3 ± sqrt(7)
t1 = 3 + sqrt(7) = 5.645751311... seconds
t2 = 3 - sqrt(7) = 0.354248689... seconds
on its way up the ball will pass the mark of 13 meters after about 0.35 seconds, and on its way back down it will pass the mark of 13 meters again after about 5.65 seconds.