The dimensions of the rectangle in terms of x are (x-6) and (x+3).
What in mathematics is a quadratic equation?
x ax2 + bx + c = 0 is a quadratic equation, which is a second-order polynomial equation in a single variable. a 0. It has at least one solution because it is a second-order polynomial equation, which is guaranteed by the algebraic fundamental theorem. The answer could be simple or complicated.
Given that:
A = x^(2) - 3x - 18
By solving this equation we can get the values of length and breath of rectangle
A = x^(2) - 6x + 3x - 18
A = x(x-6)+3(x-6)
A = (x-6)(x+3)
Hence the area of rectangle is equal to L * W
Hence, the dimensions of the rectangle are (x-6) and (x+3).
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Ryan is making a fruit drink. The directions say to mix 3 cups of water with 1 1/2 scoops of powdered fruit mix.
1. how many cups of water should he use with 6 scoops of fruit mix?
2. Rate needed?
3. Unit rate?
4. Interpretation of unit rate?
For per unit scoops of powdered 2 cups of Water is Needed.
What is the average rate of change?It is a measure of how much the function changed per unit, on average, over that interval. It is derived from the slope of the straight line connecting the interval's endpoints on the function's graph.
Given, Ryan is making a fruit drink. The directions say to mix 3 cups of water with 1 1/2 scoops of powdered fruit mix.
We have to find how many cups of water should he use with 6 scoops of fruit mix
Let "n" be the number of cups required for 6 scoops of fruit mix
3 cups of water ⇒ 1.5 scoops of fruit mix.
Then, n cups of water ⇒ 6 scoops of fruit mi
So, by cross multiplication,
6 * 3 = n *1.5
n = 12
Ryan has to use 12 cups of water for 6 scoops.
thus,
For per unit scoops of powdered 2 cups of Water is Needed.
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Bert and Harriet collect quarters and pennies. When they wrapped coins to take to the bank, they had $42.50. If they wrapped a total of 410 coins, how many were pennies?
Answer:
there are 250 pennies
Step-by-step explanation:
q = quarters
p =pennies
q+p = 410 so q = 410 -p
.25q+ .01p = 42.50
Replace q with 410 -p
.25(410-p) +.01p = 42.50
102.50 - .25p +.01p = 42.50
Combine like terms
102.50 -.24p = 42.50
Subtract 105.20 from each side
-.24p = 42.50-102.50
-.24p =-60
Divide each side by -.24
-.24p/-.24 =-60/-.24
p =250
Consider the following scenario to understand the relationship between marginal and average values. Suppose Lorenzo is a professional b. player, and his game log for free throws can be summarized in the following table.
The missing points from the Column is:
Game Free-Throw Percentage: 60 20 60 80
Average Free-Throw Percentage: 70 60 55 56.67
Game Game Total Game Average
Result Free-Throw Free-Throw
Percentage Percentage
1 8/10 8/10 80 80
2 6/10 14/20 60 70
3 1/5 15/25 20 60
4 3/5 18/30 60 55
5 8/10 26/40 80 56.67
In the "Total" column, we keep track of the cumulative number of successful free throws out of the total attempts.In the "Game Free-Throw Percentage" column, we calculate the percentage of successful free throws made in each game.In the "Average Free-Throw Percentage" column, we calculate the average free-throw percentage up to that game by dividing the cumulative successful free throws by the cumulative total attempts and multiplying by 100.Learn more about Cumulative Frequency here:
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The question attached here seems to be incomplete, the complete question is
Fill in the columns with Dmitri's free-throw percentage for each game and his overall free-throw average after each game.
Game Game Result Total Game Free-Throw Percentage Average Free-Throw Percentage
1 8/10 8/10 80 80
2 6/10 14/20
3 1/5 15/25
4 3/5 18/30
5 8/10 26/40
Put numbers in the blank to show the meaning of 5x2 =10
___ is ___ times as ____
Answer:
10,2,5
Step-by-step explanation:
find the volume of the region. the region bounded by z = x2 y2 and z = 20 − x2 − 2y2
The volume of the region is approximately 333.3.
The volume of the region bounded by the two equations z = x2 y2 and z = 20 − x2 − 2y2 can be calculated by setting up a triple integral and integrating it with respect to x, y, and z. To do this, we must first find the limits of integration.
For the x variable, the two equations both contain x2 so the limits of integration would be -√20 and √20. For the y variable, the equations contain y2 so the limits of integration would be -√10 and √10.
Finally, for the z variable, the limits of integration would be 0 and 20. Using these limits we can now write our triple integral, ∫∫∫(20 - x2 - 2y2)dx dy dz, and integrate it to find the volume of the region.
After integrating, we find that the volume is approximately 333.3.
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jensen, arriving at a bus stop, just misses the bus. suppose that he decides to walk if the (next) bus takes longer than 5 minutes to arrive. suppose also that the time in minutes between the arrivals of buses at the bus stop is a continuous random variable with a u(4,6) distribution. let x be the time that jensen will wait. 24 44 a. what is the probability that x is less than 41 (minutes)? 2 b. what is the probability that x equals 5 (minutes)? c. is x a discrete random variable or a continuous random variable?
Question A: to find the probability that x is less than 41 minutes, we need to find the probability that x is in the interval (0, 41). We can do this by finding the area under the curve of the probability density function of the continuous random variable x in the interval (0, 41).
The probability density function of a continuous random variable is given by:
f(x) = (1/b - a) * 1Where a and b are the lower and upper bounds of the distribution, respectively, and 1 is a constant.
For x in this case, the distribution is uniform and the lower bound is 4 and the upper bound is 6, so the probability density function is:
f(x) = (1/6 - 4) * 1 = 1/2To find the probability that x is in the interval (0, 41), we need to find the area under the curve of the probability density function in that interval. Since the probability density function is constant in this case, the area under the curve is just the product of the probability density and the width of the interval. The width of the interval (0, 41) is 41-0 = 41, so the probability that x is in the interval (0, 41) is:
P(0 < x < 41) = (1/2) * 41 = 20.5Therefore, the probability that x is less than 41 minutes is 20.5.
Question B: the probability that x equals 5 minutes is 0, since x is a continuous random variable and can take on any value in the interval (4, 6). A continuous random variable cannot take on a specific value with probability greater than 0, only values in an interval with probability greater than 0.
Question C: x is a continuous random variable, as it can take on any value in the interval (4, 6). Continuous random variables are those that can take on any value in an interval, rather than only specific, discrete values.
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A function() is graphed
What is the slope of the function?
m
What is the intercept of the function?
Which equation represents the graph of the function?
What is a scientific hypothesis? Explain the difference between a guess and a hypothesis. Why do scientists need a hypothesis?
Are there any scientific hypotheses that can’t be tested? If yes, what are potential questions that cannot be answered by science?
A scientific hypothesis is a proposed explanation or prediction based on limited evidence or prior knowledge, which is subject to further investigation and testing.
A guess is a speculative, unsupported statement without any logical basis, whereas a hypothesis is an educated assumption derived from existing knowledge, observations, or theories. Unlike a guess, a hypothesis is testable and can be supported or refuted by evidence gathered through scientific methods.
Scientists need a hypothesis to provide a framework for their research and guide their investigations. It helps them define the specific question they want to answer and provides a starting point for designing experiments or making observations. By formulating a hypothesis, scientists can systematically evaluate and analyze data, ultimately leading to a deeper understanding of the phenomenon under investigation.
There are indeed scientific hypotheses that cannot be directly tested or proven due to practical or ethical constraints. For example, hypotheses related to historical events that occurred in the distant past may not have accessible evidence for direct testing. Additionally, some questions related to consciousness, subjective experiences, or philosophical concepts may lie beyond the scope of scientific inquiry, as they may not be objectively measurable or observable.
While science has its limitations, it is a powerful tool for investigating and understanding the natural world. However, there are questions that fall outside the realm of scientific inquiry and require other methods of investigation, such as philosophical or ethical considerations.
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What ordered pair represents the total number of fish they each caught after four hours?
Write and solve an equation for the situation.
The perimeter of a parallelogram is 56 meters. The width of the parallelogram is 8 meters less than its length. Find the length and the width of the parallelogram.
The purchased cost of a 5-m3 stainless steel tank in 1995 was $10,900. The 2-m-diameter tank is cylindrical with a flat top and bottom. If the entire outer surface of the tank is to be covered with 0.05-m-thickness of magnesia block, estimate the current total cost for the installed and insulated tank. The 1995 cost for the 0.05-m-thick magnesia block was $40 per square meter while the labor for installing the insulation was $95 per square meter.
The estimated current total cost for the installed and insulated tank is $12,065.73.
The first step is to calculate the surface area of the tank. The surface area of a cylinder is calculated as follows:
surface_area = 2 * pi * r * h + 2 * pi * r^2
where:
r is the radius of the cylinder
h is the height of the cylinder
In this case, the radius of the cylinder is 1 meter (half of the diameter) and the height of the cylinder is 1 meter. So the surface area of the tank is:
surface_area = 2 * pi * 1 * 1 + 2 * pi * 1^2 = 6.283185307179586
The insulation will add a thickness of 0.05 meters to the surface area of the tank, so the total surface area of the insulated tank is:
surface_area = 6.283185307179586 + 2 * pi * 1 * 0.05 = 6.806032934459293
The cost of the insulation is $40 per square meter and the cost of labor is $95 per square meter, so the total cost of the insulation and labor is:
cost = 6.806032934459293 * (40 + 95) = $1,165.73
The original cost of the tank was $10,900, so the total cost of the insulated tank is:
cost = 10900 + 1165.73 = $12,065.73
Therefore, the estimated current total cost for the installed and insulated tank is $12,065.73.
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a newsletter publisher believes that over 54% of their readers own a personal computer. is there sufficient evidence at the 0.05 level to substantiate the publisher's claim?
Null hypothesis \(H_{0}\): u = 0.54 and Alternative hypothesis \(H_{a}\): u > 0.54 is the publisher's claim supported by enough evidence at the 0.05 level.
Null hypothesis \(H_{0}\) : u = 0.54
Alternative hypothesis \(H_{a}\): u > 0.54
The percentage of their readers who own a computer.
The null hypothesis ( \(H_{0}\)) attempts to demonstrate that there is no substantial variation amongst variables or that a variable is no different from its mean.
While an alternative Hypothesis ( \(H_{a}\)) seeks to demonstrate that a new hypothesis, rather than the old one, is correct. That a variable deviates significantly from the mean.
As a result, in the preceding example;
Null hypothesis \(H_{0}\) : u = 0.54
Alternative hypothesis \(H_{a}\): u > 0.54
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Hi i need help with this
answer: perimeter of the rectangle is 22 and the perimeter of the square is 8 making the perimeter of the shapes combined 30
In triangle 4JKL, we have JK = 9 and KL = 15. If JL is an integer, what are the largest and smallest possible values for JL?
Answer:
The largest possible value is 23
The smallest is 7
Step-by-step explanation:
To get the length of JL, we use the triangle inequality theorem
The theorem is that the sum of the measure of any two sides of a triangle must be greater than the measure of the third side of the triangle for the triangle to exist
With respect to this, 9 + 15 must be greater than JL
since JL is an integer ( integers are whole numbers); we have the following
9 + 15 = 24
JL is less than 24; so the nearest integer closest to 24 is 23
Now, let us get the smallest possible value
For the smallest possible value;
Let us call that x
9 + x > 15
15 + x > 9
From the first inequality;
x > 15-9
x > 6
The smallest integer greater than is 7
So the smallest possible value for JL is 7 and the largest is 23
0.4(x - 2) = -14 (find x)
-2/5 (y + 6) =16 (find y)
MY QUESTION KEEPS GETTING DELETED BY KATIE :< pls stop
Answer:
x = -33, y= -46
Step-by-step explanation:
0.4(x - 2) = -14
0.4x - 0.8 = -14
0.4x = -13.2
x = -33
-2/5(y + 6) = 16
-2/5y - 2 2/5 = 16
-2/5y = 18 2/5
y = -46
Answer && Step-by-step explanation:
divide both sides by .4
.4/.4(x-2)=-14/.4 == x-2=-35
add 2 to both sides
x-2+2=-35+2 ==x=-33
x=-33 is your answer
Use the same methodology for finding y
Find a · b, given a = 12(cos pi/3 + i sin(pi/3)), b = 3 (cos(pi/4)+ i sin(pi/4))
Show 3 decimal places.
Please and thank you!!!
a = 12 (cos(π/3) + i sin(π/3))
b = 3 (cos(π/4) + i sin(π/4))
a • b = 36 (cos(π/3) cos(π/4) + i cos(π/3) sin(π/4) + i cos(π/4) sin(π/3) + i ² sin(π/3) sin(π/4))
… = 36 (cos(π/3 + π/4) + i sin(π/3 + π/4))
… = 36 (cos(7π/12) + i sin(7π/12))
… ≈ -9.32 + i 34.8
teresa wants to make some cookies the recipe calls for 5 eggs and 10 tablespoons of butter but she only has 3 eggs she needs to know if she has enough butter to make the cookies with only three eggs how much butter will she need
Answer:
I think Teresa needs 6 tablespoons of butter..
Step-by-step explanation:
Hope this right...but if it's not,im so sorry
on exploration 4.3.3, what is a vertical asymptote for question 2?
A vertical asymptote is a line on the x-axis where the graph of a function approaches infinitely close but does not actually reach. In this case, the vertical asymptote is x = 4.
In exploration 4.3.3, the vertical asymptote for question 2 is at x = -2. Let's see what is meant by a vertical asymptote.What is a vertical asymptote?A vertical asymptote is a line that a function approaches but never touches.
The curve gets arbitrarily close to the vertical line but never touches it. When the function approaches a vertical asymptote, the function approaches infinity or negative infinity.For instance, consider the function f(x) = 1/x. It has a vertical asymptote at x = 0. This is because the function's value becomes increasingly larger as x approaches 0 from the positive side, and the value of the function becomes increasingly smaller as x approaches 0 from the negative side.Therefore, if a curve goes on increasing or decreasing on both sides of a vertical line (called a vertical asymptote), the curve approaches that line but never touches it. This is the basic idea of a vertical asymptote.What is the vertical asymptote for question 2?The rational function f(x) = (x + 2) / [(x + 2)^2 - 4] is being studied in question 2 of exploration 4.3.3. It can be seen that (x + 2)^2 - 4 = (x + 2 - 2)(x + 2 + 2) = (x)(x + 4).Therefore, the denominator (x + 2)^2 - 4 can be written as (x)(x + 4).The vertical asymptotes of a rational function occur where the denominator equals zero. Since the denominator is (x)(x + 4), the vertical asymptotes occur where x = 0 or x = -4.However, x = 0 is not a vertical asymptote because there is a hole in the graph. So, the only vertical asymptote is at x = -2. This means that the curve approaches x = -2 but never touches it. Therefore, the vertical asymptote for question 2 in exploration 4.3.3 is x = -2.
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Find the value of y for the given value of x.a. y = 10x; x = -3b. y = 6 - 2x; x = 11 c. y = 4x + 5; x = 1/2
Part a
y = 10x
For x=-3
substitute the value of x in the equation and evaluate it
y=10(-3)=-30
Part b
y = 6 - 2x
For x=11
y=6-2(11)=-16
Part c
y = 4x + 5
For x=1/2
y=4(1/2)+5=7
e ohio lottery has a game called pick 4 where a player pays $1 and picks a four-digit number. if the four numbers come up in the order you picked, then you win $3900. a) write the probability distribution for a player's winnings. fill in the table below. for the computer to grade this one correctly make sure that your x values are from smallest to largest.
The probability of winning $3,899 is 0.0001, which is a very small probability, but still possible.
To write the probability distribution for a player's winnings in the Pick 4 game, we need to consider all the possible outcomes and their probabilities.
There are a total of 10,000 possible four-digit numbers that can be drawn in the game. Since the player has to match the numbers in the exact order, there is only one winning combination for each four-digit number. Therefore, the probability of winning is 1/10,000.
To calculate the player's winnings, we need to subtract the $1 cost of playing from the $3,900 prize. Thus, the player's net winnings can be calculated as follows:
Net Winnings = $3,900 - $1 = $3,899
The probability distribution for the player's winnings can be summarized in the following table:
| Winnings (x) | Probability (P) |
|--------------|-----------------|
| $0 | 0.9999 |
| $3,899 | 0.0001 |
Note that the table shows the possible winnings (x) in ascending order, as requested. The probability of winning $0 is 0.9999, which means that the player is most likely to lose their $1 bet.
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4−32⋅(−0.25)−12÷1/3 help
Answer:
Your answer is 8.
Answer:
Step-by-step explanation:
-24
Byron and Cari are best friends. Byron wants to give a collage photo frame to Cari on her birthday. He measures the photo frame at 12 inches by 18 inches. He wants to cover the photo frame with a golden cloth at a cost of $7 per square inch. How much will it cost for Byron to cover his photo frame?
Answer:
The answer is $1512.
Step-by-step explanation:
First, multiply 12 by 18, you get 216. Then multiply that by 7, you get 1512. Bryon will need $1512 to cover his photo frame.
Tell whether the points form a right triangle.
(0,0), (0,5), (2,0)
Answer:
Yes.
Step-by-step explanation:
Plotting these 3 points on a coordinate plane, this forms a right triangle. This triangle is shown by the picture.
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If the mean of a set of 12 number is 13, then the sum of the numbers is:
Answer:
The first image is the answer and the second image is the explanation.
Step-by-step explanation:
Answer: 156
to find the mean of a number, you would have to add all the numbers and then divide by how many numbers there are.
so here, i just multiplied 13x12 because 12 is how many numbers are and 13 is the final solution.
9. A motocross ramp is 12 feet tall and 24 feet long. What is the slope of the 1
ramp as a fraction in lowest terms? (Think rise over run.) *
12 ft
24 ft
O 12/24
O 24/12
O 1/2
0 2/1
Answer:
1/2
Step-by-step explanation:
12 is the rise 24 is the run
12/24 simplified is 1/2
The required slope of the given ramp is given by 1/2. Option C is correct.
Given that,
A motocross ramp is 12 feet tall and 24 feet long. What is the slope of the ramp as a fraction in the lowest terms is to be determined.
The slope of the line is a tangent angle made by line with horizontal. i.e. m =tanx where x in degrees.
Here,
The slope of the ramp is evaluated as,
= vertical height / horizontal distance,
= 12 / 24
= 1 / 2
Thus, the required slope of the given ramp is given by 1/2. Option C is correct.
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Determine zα for the following. (Round your answers to two decimal places.)
(a) α = 0.0089
(b) α = 0.09
(c) α = 0.707
Please explain where and how you got the answer.
Thank you.
The value of zα for the following is :
(a) α = 0.0089 is 2.37
(b) α = 0.09 is 1.34
(c) α = 0.707 is -0.545
zα is the inverse function of the standard normal CDF.
(a) Central limit c= 1-α
for α = 0.0089 , c=1-0.0089
∴ c=0.9911
Hence confidence level in percentage= 99.5%
Now, the value of zα will be calculated with the help of an excel sheet function normsinv(c).
∴zα = normsinv(c)
where c is central limit
zα = normsinv(0.9911)
zα =2.37
(b) Central limit c= 1-α
for α = 0.09 , c=1-0.09
∴ c=0.91
Hence confidence level in percentage= 91%
Now, the value of zα will be calculated with the help of an excel sheet function normsinv(c).
∴zα = normsinv(c)
where c is central limit
zα = normsinv(0.91)
zα=1.34
(c) Central limit c= 1-α
for α = 0.707 , c=1-0.707
∴ c=0.293
Hence confidence level in percentage= 29.3%
Now, the value of zα will be calculated with the help of an excel sheet function normsinv(c).
∴zα = normsinv(c)
where c is central limit
zα = normsinv(0.707)
zα= -0.545
Therefore zα value for 0.0089 is 2.37, for 0.09 is 1.34 and for 0.707 it is -0.545.
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The terminal side of θ in standard position contains the
given point. Find the values of the six trigonometric functions of
θ.
( 4 , 3 )
Answer: Read the step by step explanation for the answer
Step-by-step explanation:
We can use the Pythagorean theorem to find the hypotenuse of the right triangle formed by the given point (4, 3) and the origin (0, 0):
r = √(4² + 3²) = 5
Then we can use the coordinates of the point (4, 3) to determine the values of the trigonometric functions:
sin(θ) = opposite/hypotenuse = 3/5
cos(θ) = adjacent/hypotenuse = 4/5
tan(θ) = opposite/adjacent = 3/4
csc(θ) = hypotenuse/opposite = 5/3
sec(θ) = hypotenuse/adjacent = 5/4
cot(θ) = adjacent/opposite = 4/3
Therefore, the values of the six trigonometric functions of θ are:
sin(θ) = 3/5
cos(θ) = 4/5
tan(θ) = 3/4
csc(θ) = 5/3
sec(θ) = 5/4
cot(θ) = 4/3
how many of them contain beads of at least two different colors? (hint: calculate how many beads contain exactly 1 color, and subtract from the first answer.)
To determine the number of beads that contain at least two different colors, subtract the number of beads that contain only one color from the total number of beads.
1. Calculate the number of beads that contain exactly one color:
Let's assume there are n colors available.For each color, there are n beads of that color.So, the total number of beads of only one color is n * n.2. Calculate the total number of beads:
If we assume there are m beads in total, where each bead can be of any color.The total number of beads is m.3. Subtract the number of beads that contain only one color from the total number of beads to find the number of beads with at least two different colors:
The number of beads with at least two different colors = Total number of beads - Number of beads with exactly one color.Number of beads with at least two different colors = m - n * n.Let's take an example to illustrate this:
Suppose there are 4 different colors available (n = 4), and there are a total of 100 beads (m = 100).
Calculate the number of beads that contain exactly one color:
Number of beads with exactly one color = n * n = 4 * 4 = 16.
Calculate the number of beads with at least two different colors:
Number of beads with at least two different colors = Total number of beads - Number of beads with exactly one color.
Number of beads with at least two different colors = 100 - 16 = 84.
So, in this example, there are 84 beads that contain at least two different colors.
In general, to find the number of beads that contain at least two different colors, subtract the number of beads with exactly one color from the total number of beads, using the formula derived in steps 1 and 2.
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Which graph shows a rate of change of one-half between –4 and 0 on the x-axis? On a coordinate plane, a straight line with a positive slope crosses the x-axis at (6, 0) and the y-axis at (0, 3). Solid circles appear on the line at (negative 4, negative 1), (0, 3).
The graph that shows a rate of change of one-half between –4 and 0 on the x-axis is (Option A) "On a coordinate plane,a straight line with a positive slope crosses the x-axis at (6, 0) and the y-axis at (0, 3). Solid circles appear on the line at (- 4,-1) and (0, 3).
How is this so?On a coordinate plane,a straight line with a positive slope crosses the x-axis at (-6, 0) and the y-axis at (0, 3). Solid circles appear on the line at (-4, 1),(0, 3).
Given two points of a function,(x1, y1) and (x2, y2), its rate of change between them is -
Rate of change - (y2 - y1)/(x2 - x1)
Points of the 1st graph - (-4, 1), (0, 3).
Rate of change - (3- 1)/(0 - (-4)) = 1/2
Points of the 2nd graph - (-4, 1), (0, -3).
Rate of change - (-3 - 1)/(0 - (-4)) = -1
Points of the 3rd graph - (-4, 0), (0, 4).
Rate of change - (4 - 0)/(0 - (-4)) = 1
Points of the 4th graph - (-4, 0.25), (0, 4).
Rate of change - (4 - 0.25)/(0 - (-4)) = 0.9375
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Full Question:
Although part of your question is missing, you might be referring to this full question:
Which graph shows a rate of change of one-half between –4 and 0 on the x-axis?
On a coordinate plane, a straight line with a positive slope crosses the x-axis at (6, 0) and the y-axis at (0, 3). Solid circles appear on the line at (-4, -1) and (0, 3).
On a coordinate plane, a parabola opens up. It goes through (-5.25, 4), has a vertex of (0, -3), and goes through (5.25, 4). Solid circles appear on the parabola at (-4, 1) and (0, -3).
On a coordinate plane, a parabola opens down. It goes through (-5.5, -4), has a vertex of (0, 4), and goes through (5.5, -4). Solid circles appear on the parabola at (-4, 0) and (0, 4).
On a coordinate plane, a curved line opens up and left in quadrant 2. It is asymptotic to the negative x-axis and positive y-axis. Solid circles appear on the line at (-4, 0.25) and (0, 4).
Kevin can mow the lawn in 1.5 hours. Together, Kevin and Eric can mow the lawn in 30 minutes. How long will it take Eric to mow the lawn alone?
HELP PLS
Answer:
45
Step-by-step explanation:
These work problems are always done in terms of fractions ie if both (Kevin & Eric) took 30mins to mow and Kevin took 1.5hrs (90mins) alone then we can make an equation like below
1/time took for both = 1/time took for Kevin + 1/time took for Eric
1/30 = 1/90+1/x ==> calling time took for Kevin x
solving the above 1/x = 1/30-1/90
1/x=2/90
x=45
Given that Kevin takes 1.5 hours to mow the lawn alone and together
with Eric it takes 30 minutes The time it takes Eric alone is 45 minutes.
How can the rate of work of Eric be found?The time it takes Kevin to mow the lawn, K = 1.5 hours
The time it takes Kevin and Eric to mow the lawn, B = 30 minutes = 0.5 hours
Required:
The time it takes Eric to mow the lawn alone.
Solution:
Let K represent the time it takes Kevin to mow the lawn alone and let E
represent the time it takes Eric to mow the lawn alone, we have;
\(\mathbf{\dfrac{1}{K} + \dfrac{1}{E} }= \dfrac{1}{T}\)
Which gives;
\(\dfrac{1}{1.5} + \dfrac{1}{E} = \dfrac{1}{0.5}\)
Which gives;
\(\dfrac{1}{E} = \dfrac{1}{0.5} - \dfrac{1}{1.5} =\dfrac{4}{3}\)
Therefore;
\(E = \dfrac{1}{\dfrac{4}{3} } = \dfrac{3}{4} = \mathbf{ 0.75}\)
The time it takes Eric to mow the lawn alone, E = 0.75 hours
0.75 hours = 0.75 × 60 minutes = 45 minutes
The time it takes Eric to mow the lawn alone, E = 45 minutes
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