The approximate area of the regular decagon, rounded to the nearest hundredth, is 190.78 square units.
What is the area of a regular decagon with an apothem of 6.2 units, rounded to the nearest hundredth?To find the area of a regular decagon with an apothem of 6.2 units, we can use the formula:
Area = (1/2) × apothem × perimeter
To find "s", we can use the fact that a regular decagon can be divided into 10 congruent triangles, where each triangle has an interior angle of 144 degrees. We can use trigonometry to find the length of the side "s" using one of these triangles:
tan(72) = (s/2.6)s = 2.6 × tan(72)s ≈ 6.16Now we can find the perimeter of the decagon:
Perimeter = 10 × sPerimeter = 10 × 6.16Perimeter ≈ 61.62Finally, we can substitute the apothem and perimeter into the formula to find the area:
Area = (1/2) × 6.2 × 61.62Area ≈ 190.78Rounding to the nearest hundredth, the area of the regular decagon is approximately 190.78 square units.
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what is 88 closer to 64 or 125
Answer:
64
Step-by-step explanation:
Answer:
64...i think
Step-by-step explanation:
125 - 88=37
88-64=24
PLS MARK BRAINLIEST
Identify the measure of arc FE⏜ given the measure of arc FGC⏜ is 220∘
The value of the angle of the arc FE⏜ is calculated as: 20°
How to find the angle at the arc?The angle of an arc is identified by its two endpoints. The measure of an arc angle is found by dividing the arc length by the circle's circumference, then multiplying by 360 degrees. Formulas for calculating arcs and angles vary based on where they are in reference to the circle.
Now, from the given image, we see that:
FGC⏜ = 220°
∠B = 30°
∠OEC = ∠OCE = 30°
CDE⏜ = 220°
Thus:
FE⏜ = 360° - 220° - 120°
FE⏜ = 20°
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The point R(-2, 9) is rotated 90° clockwise around the origin. What are the coordinates of the resulting point, R′?
The coordinates of the resulting point, R′ are R' = (-9, -2)
What are the coordinates of the resulting point, R′?From the question, we have the following parameters that can be used in our computation:
The point R(-2, 9) is rotated 90° clockwise around the origin.
This means thar
R = (-2, 9)
Rotation rule = 90° clockwise around the origin.
The rotation rule of 90° clockwise around the origin is
(x,y) becomes (y,-x)
So, we have
R' = (y, -x)
Substitute the known values in the above equation, so, we have the following representation
R' = (-9, -2)
Hence, the coordinates of the resulting point, R′ are R' = (-9, -2)
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Mabel saved up her money and bought a model train. Each of the 8 cars on the train was the same length. When Mabel put all the cars together, the train was 3 feet long. How long was each car?
Each car on Mabel's train is a little less than half a foot long i.e., 3/8 feet long, or 0.375 feet long. This is solved by using simple mathematical operations.
To find the length of each car on Mabel's train, we can use the formula:
Total length of train = length of one car × number of cars
We are given that Mabel's train has 8 cars and is 3 feet long, so we can substitute those values into the formula and solve for the length of one car:
3 = x × 8
where x is the length of one car.
To solve for x, we can divide both sides by 8:
3/8 = x
Therefore, each car on Mabel's train is 3/8 feet long, or 0.375 feet long.
In other words, each car is a little less than half a foot long.
To help visualize this, imagine dividing the 3-foot length of the train into 8 equal parts. Each part would be 3/8 feet long, which is the length of one car. So when Mabel puts all 8 cars together, they form a train that is 3 feet long.
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Julia just lit a new candle and then let it burn all the way down to nothing. The candle burned at a rate of 0.75 inches per hour and its initial length was 9 inches. Write an equation for
L
,
L, in terms of
t
,
t, representing the length of the candle remaining unburned, in inches,
t
t hours after the candle was lit.
The required equation for the length of the candle is L = 9-0.75t.
Given that a 9-inch candle burns at the rate of 0.75 in per hour we need to determine the equation for the length L of the candle when it burns for t hours,
So, if the candle is burning at the rate of 0.75 in per hour so after burning for t hour the length decreases by 0.75t, from the original length i.e 9 in
So, we can write the equation as =
L = 9-0.75t
Hence the required equation for the length of the candle is L = 9-0.75t.
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The seventh-grade students at Charleston Middle School are choosing one girl and one boy for student council. Their choices for girls are Michaela (M), Candice (C), and Raven (R), and for boys, Neil (N), Barney (B), and Ted (T). The sample space for the combined selection is represented in the table. Complete the table and the sentence beneath it.
Boys
Neil Barney Ted
Girls Michaela N-M
B-M
T-M
Candice N-C
B-C
T-C
Raven N-R
B-R
T-R
If instead of three girls and three boys, there were four girls and four boys to choose from, the new sample size would be ?
If there were four girls and four boys to choose from, the new sample size is one that will be a total of 16 possible combinations.
What is the sample about?When making selections for the student council's representatives, the sample size belongs to the whole of the feasible options.
To know the sample size, we must reason every conceivable permutation involving a single female and a single male.
So, if there were four girls and four boys to choose from, the new sample size would be:
There are:
4 choices for girls
4 choices for boys.
So, for each girl's choice, there would be 4 corresponding choices for boys.
Hence it will be:
4 x 4 = 16
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Need help with these questions!! Person who answers will be marked brainliest
Answer:
1.5 for both
Step-by-step explanation:
Taking each number and multiplying it by 1.5 will get you the dilated coordinates
If KJ=10, find the length of arc HJ
Answer:
Step-by-step explanation:
The arc length formula is
[tex]L=\frac{\theta}{360}*2\pi r[/tex]
Theta is the angle that intersects arc HJ. That measure is 180-122 which is 58 degrees. We put that into the formula along with the radius measure of 10 to get:
[tex]L=\frac{58}{360}*2\pi (10)[/tex] which gives us, rounded to the nearest hundredth,
L = 10.12 units
Ben earns $12. 50 per hour and $6 for each delivery he makes. He wants to earn $168 in an 8-hour workday.
Part A) Which equation could you use to solve for the least number of deliveries he must make to reach his goal?
Part B) What is the least number of deliveries he must make to reach his goal?
Answer:
ben earns $9 per hour and $6 for each delivery he makes
Step-by-step explanation:
suppose x is a random variable with mean mu and standard deviation sigma. If a large number of trials are observed, at least what percentage of these values is expected to lie between mu minus 2 sigma and mu plus 2 sigma?
At least 95% of the observed values are expected to lie between mu minus 2 sigma and mu plus 2 sigma.
This is because of the empirical rule, also known as the 68-95-99.7 rule, which states that in a normal distribution, approximately 68% of the observations will fall within one standard deviation of the mean, about 95% of the observations will fall within two standard deviations of the mean, and around 99.7% of the observations will fall within three standard deviations of the mean.
In this case, we are given that x has mean mu and standard deviation sigma. Therefore, about 95% of the values of x are expected to lie between mu minus 2 sigma and mu plus 2 sigma, as this interval covers two standard deviations on either side of the mean.
Mathematically, we can express this as:
P(mu - 2sigma < x < mu + 2sigma) ≈ 0.95
where P is the probability that x falls within the interval mu - 2sigma to mu + 2sigma.
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(2) Use the Comparison Test or the Limit Comparison Test to determine the convergence or divergence of the following series. Justify your answer. 23-1 5k - 1 k=1 (3) Use the Integral Test to determine the convergence or divergence of the following series. Justify your answer. Ink k k=1
2)By using Comparison Test,the series 23-1 5k-1 k=1,is divergent.
3)By using Integral Test the series Ink k k=1 is divergent.
2) To determine the convergence or divergence of the series 23-1 5k - 1 k=1:
For the first series, 23-1 5k-1 k=1, we can use the Limit Comparison Test.
Let's compare it to the series 5k-1 k=1.
We take the limit as k approaches infinity of the ratio of the two series:
lim(k->∞) [(23-1 5k-1) / (5k-1)] = lim(k->∞) [23 / 5] = 23/5
Since this limit is finite and positive, and the series 5k-1 diverges (as it is a p-series with p=1),
we can conclude that the given series also diverges.
3)To determine the convergence or divergence of the series Ink k k=1:
For the second series, Ink k=1, we can use the Integral Test.
We need to check if the following improper integral converges or diverges:
∫(1 to ∞) ln(x) dx
Integrating by parts, we get:
∫(1 to ∞) ln(x) dx = [xln(x) - x]1∞ + ∫(1 to ∞) dx/x
The first term evaluates to -∞, and the second term is the divergent harmonic series.
Therefore, the improper integral and the series both diverge.
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3.
What does limit as x goes to infinity of the quotient of f of x and g of x equals 5 show? (4 points)
g(x) grows faster than f(x) as x goes to infinity.
f(x) and g(x) grow at the same rate as x goes to infinity.
f(x) grows faster than g(x) as x goes to infinity.
L'Hôpital's Rule must be used to determine the true limit value
The statement "limit as x goes to infinity of the quotient of f of x and g of x equals 5" means that as x gets larger and larger, the ratio of f(x) to g(x) approaches 5.
If f(x) grows faster than g(x) as x goes to infinity, then the ratio of f(x) to g(x) would approach infinity, not 5.
If f(x) and g(x) grow at the same rate as x goes to infinity, then the ratio of f(x) to g(x) would approach a constant value, not necessarily 5.
Therefore, the statement "limit as x goes to infinity of the quotient of f of x and g of x equals 5" shows that g(x) grows faster than f(x) as x goes to infinity. L'Hôpital's Rule is not necessary to determine this conclusion.
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if I draw a marble 48 times a white marble is selected 35 times ana a yellow one is selected 13 times what is the probability of the next one to be yellow
A 13%
B 27%
C 51%
D 63%
If we are drawing without replacement, the probability is approximately 27.7%, which is closest to option B: 27%.
What is the probability that the next marble is yellow?The probability of drawing a yellow marble on the next draw depends on whether we are drawing with or without replacement.
If we are drawing without replacement, then the probability of drawing a yellow marble is 13 out of the remaining 47 marbles, since we have already drawn 35 white marbles and 13 yellow marbles out of the 48 total marbles.
If we are drawing with replacement, then the probability of drawing a yellow marble on the next draw is still 1/3, or approximately 33.3%.
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If 3 quarts is greater then 4 prints is that an equivalent measure
If 3 quarts is greater than 4prints, then the measure is not equivalent.
What is equivalent measurement?Equivalent units can be used to convert different units to the same unit for comparison. Equivalent means equal. For example , 1 kilogram is equal to 1,000 grams.
For example,
3 teaspoons = 1 tablespoon.
4 tablespoons = 1/4 cup.
5 tablespoons + 1 teaspoon = 1/3 cup.
8 tablespoons = 1/2 cup.
1 quart = 2pints
therefore 3 quarts = 2×3 = 6pints
therefore the statement that 3 quarter is greater than 4 prints is true and not an equivalent measure.
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A 2 yard piece of copper wire costs $9. 72. What is the price per foot
the price per foot of the copper wire is $1.62.
What is the arithmetic operation?
The basic mathematical operations are addition, subtraction, multiplication, and division, which involve manipulating two or more quantities. They are essential to the study of numbers, including the order of operations, and are fundamental to other mathematical areas such as algebra, data management, and geometry. Understanding the rules of arithmetic operations is crucial for solving problems that involve these operations.
There are 3 feet in one yard, so 2 yards of copper wire is equal to 6 feet.
To find the price per foot, we need to divide the total price by the number of feet:
Price per foot = Total price ÷ Number of feet
Price per foot = $9.72 ÷ 6
Price per foot = $1.62
Therefore, the price per foot of the copper wire is $1.62.
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The given segment is the diameter of a circle bar cd the coordinates of c are (-3,5) and the coordinates of d are (6,-2) . find the center of the circle
To find the center of the circle, we need to find the midpoint of the diameter segment CD.
Using the midpoint formula, we can find the coordinates of the midpoint M:
Midpoint formula:
M = ( (x1 + x2)/2 , (y1 + y2)/2 )
Plugging in the coordinates of C (-3,5) and D (6,-2):
M = ( (-3 + 6)/2 , (5 - 2)/2 )
M = (1.5, 1.5)
Therefore, the center of the circle is at point M with coordinates (1.5, 1.5).
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Madison swims 2/5 mile in an hour. Declan swims 7/10 mine in 1/5 hour. Who swims faster?
Declan swims faster than Madison, with a speed of 7/2 miles per hour compared to Madison's speed of 2/5 miles per hour.
How to compare swimming speed?Declan swims faster than Madison. While Madison swims 2/5 mile in an hour, which means her speed is 2/5 miles per hour, Declan swims 7/10 mile in 1/5 hour, which means his speed is 7/2 miles per hour. This indicates that Declan's speed is greater than Madison's speed.
In fact, we can see that Declan's speed is almost 4 times faster than Madison's speed. This means that Declan can cover a greater distance in the same amount of time compared to Madison.
Therefore, based on the given information, we can confidently say that Declan swims faster than Madison.
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If f(x) = x2 − 6x − 4 and g(x) = 5x + 3, what is (f + g)(−3)? (1 point)
41
35
11
−35
As per the given information in the question, we can compute that the correct option is C) 11.
According to the question:
[tex]f(x)=x^{2} -6x-4[/tex]
[tex]g(x)=5x+3[/tex]
Therefore,
[tex](f+g)(x)= f(x)+g(x) \\
=x^{2} -6x-4+5x+3 \\
=x^2-x-1[/tex]
Now, to find (f+g)(-3):
substituting x=-3 in the above equation
we get,
[tex](f+g)(-3)= (-3)^2-(-3)-1 \\
= 9+3-1 \\
=11[/tex]
Hence (f+g)(-3)=11
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given m||n, find the value of x
Answer:
Step-by-step explanation:
The value of x is 19 if the lines l and m are parallel.
The lines l and m are parallel
The corresponding angles are equal
We have to find the value of x
6x-9 = 5x+10
Let us take all the variable terms on one side
6x-5x=10+9
x=19
Hence, the value of x is 19 if the lines l and m are parallel.
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Sylvia’s car trunk measures 4.25 ft wide by 4 ft deep and 4 1 thirdft high. she has cubic boxes 16 inches wide and smaller rectangular boxes 3 inches wide by 6 inches long and 4 inches high. she has to get as many of the large boxes into her trunk as she can, and after that, she can fill the space up with the smaller boxes. how many large and small boxes can she fit into her trunk?
Sylvia can fit 9 large cubic boxes and 240 small rectangular boxes into her car trunk.
How many boxes can fit in Sylvia's car trunk?We first need to convert all measurements to the same unit. Since the large cubic boxes are given in inches, we need to convert the dimensions of the trunk to inches as well.
The trunk measures 51 inches wide (4.25 ft x 12 in/ft), 48 inches deep (4 ft x 12 in/ft), and 53.33 inches high (4*1/3 ft x 12 in/ft).
Next, we need to determine how many large boxes can fit in the trunk. Since each large box is 16 inches wide,
we can fit 3 boxes across the width of the trunk:
(51 inches ÷ 16 inches = 3.19)
Similarly, we can fit 3 boxes deep and 3 boxes high.
Therefore, the maximum number of large boxes Sylvia can fit in her trunk is:
27 (3 x 3 x 3 = 27)
After fitting as many large boxes as possible, we can calculate the remaining volume of the trunk and use this to determine how many small boxes can fit.
The remaining volume is approximately 59,712 cubic inches (51 in x 48 in x 20 in).
Dividing this by the volume of each small box:
(3 in x 6 in x 4 in = 72 cubic inches)
We can fit 829 small boxes in the remaining space.
Therefore, Sylvia can fit a total of 27 large boxes and 829 small boxes in her trunk.
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Jovi's garden is 32 feet long and 8 feet wide. He divides the garden into square sections that are 4 feet long then he plants a different type of vegetable in each section. What is the greatest number of types of vegetables that jovi can play in the garden
Answer:
Step-by-step explanation:
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Suppose a mouse is placed in the maze at the right. if each desicion about direction is made at random, create a simulation to determine the probability that the mouse will find its way out before coming to a dead end or going out in the opening.
The probability of the mouse finding its way out before reaching a dead end or going out in the opening can be estimated by dividing the number of successful outcomes by the total number of trials in the sample.
To create a simulation to determine the probability that the mouse will find its way out before coming to a dead end or going out in the opening, we can follow these steps:
Create a model of the maze in a programming language such as Python.Define the starting position of the mouse as the position on the right side of the maze.Define the exit position of the maze as the position on the left side of the maze.Randomly choose a direction for the mouse to move in (up, down, left or right).Check if the chosen direction leads to a dead end or out of the maze. If it does, return a failure outcome.If the chosen direction leads to a viable path, move the mouse to that position and repeat steps 4-6 until the mouse either reaches the exit or gets stuck in a dead end.Repeat steps 2-6 multiple times to generate a sufficient sample size.Calculate the proportion of successful outcomes (i.e. the mouse finding its way out before reaching a dead end or going out in the opening) from the generated sample.The probability of the mouse finding its way out before reaching a dead end or going out in the opening can be estimated by dividing the number of successful outcomes by the total number of trials in the sample. This simulation approach can help us understand the probability of success in a random maze environment, and also explore the impact of various factors such as maze complexity, size and starting position of the mouse on the outcome.
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Nine hundred thirty six student's, 65% of the entire student body, attended the football game. find the size of the student body.
The size of the student body is approximately 1440 students.
To determine the size of the student body, we'll use the given information that 936 students represent 65% of the total number of students. We can set up a proportion to solve for the unknown total (let's call it "x"):
(65% of x) = 936
To express the percentage as a decimal, divide 65 by 100, which equals 0.65:
0.65 * x = 936
Next, to find the value of x, divide both sides of the equation by 0.65:
x = 936 / 0.65
x ≈ 1440
So, the size of the student body is approximately 1440 students. In this problem, we used the concept of percentage to find out the total number of students in the student body, knowing that 936 students (65%) attended the football game.
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Using technology, calculate the weighted mean of the RORs for each portfolio. Based on the results, which list shows a comparison of the overall performance of the portfolios, from best to worst?
The ranking from worst to best is Portfolio 3, Portfolio 2, and Portfolio 1. So, correct option is B.
To calculate the weighted mean of the RORs for each portfolio, we need to first multiply each ROR by the corresponding portfolio value and then sum the products for each portfolio. We then divide the total by the sum of the portfolio values.
The weighted mean for Portfolio 1 = [(10.4% x $700) + (-29.7% x $12,000) + (37.2% x $600) + (7.5% x $4,400) + (6.3% x $250)] / ($700 + $12,000 + $600 + $4,400 + $250) = -16.8%
Similarly, the weighted mean for Portfolio 2 = 3.8% and for Portfolio 3 = 11.2%.
Based on the results, the list that shows a comparison of the overall performance of the portfolios from worst to best is option b) Portfolio 3, Portfolio 2, Portfolio 1. Portfolio 3 has the highest weighted mean return of 11.2%, followed by Portfolio 2 with a return of 3.8%, and Portfolio 1 has the lowest weighted mean return of -16.8%.
Therefore, correct option is B.
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Complete question is:
ROR Portfolio 1 Portfolio 2 Portfolio 3
10.4% $700 $6,000 $3,500
-29.7% $12,000 $9,000 $5,500
37.2% $600 $4,500 $5,750
7.5% $4,400 $2,000 $1,500
6.3% $250 $1,100 $4,500
Calculate the weighted mean of the RORs for each portfolio. Based on the results, which list shows a comparison of the overall performance of the portfolios, from worst to best?
a) Portfolio 3, Portfolio 1, Portfolio 2
b) Portfolio 3, Portfolio 2, Portfolio 1
c) Portfolio 1, Portfolio 2, Portfolio 3
d) Portfolio 1, Portfolio 3, Portfolio 2
+ = a) Find a parametrization for the curve of intersection of 9y2 + z2 = 1 and xyz = 1 such that it is defined for all t + b) Same for surfaces x=y_and x2 - y2 =z. c) Same for surfaces x2 + y2 + z =
a) Parametrization for the curve of intersection of 9y2 + z2 = 1 and xyz = 1 is:
x = 1/(z(sqrt((1 - z^2)/9)))
y = ±sqrt((1 - z^2)/9)
z = t
b)Parametrization for the curve of intersection of x=y_and x2 - y2 =z is
x = t
y = t
z = 0
c)Parametrization for the curve of intersection of x2 + y2 + z = is
x = r cos(t)
y = r sin(t)
z = 1 - r
a) To find the curve of intersection of the two surfaces [tex]9y^2 + z^2 = 1[/tex] and xyz = 1:
We can solve for one variable in terms of the others.
For example, we can solve for y in terms of z and x using the first equation:
[tex]9y^2 + z^2 = 1[/tex]
[tex]9y^2 = 1 - z^2[/tex]
[tex]y^2 = (1 - z^2)/9[/tex]
y = ±sqrt([tex](1 - z^2)/9)[/tex]
Substituting this into the second equation, we get:
x(sqrt((1 - [tex]z^2)/9))z = 1[/tex]
x = 1/(z(sqrt((1 - [tex]z^2)/9)))[/tex]
So, a parametrization for the curve of intersection is:
x = 1/(z(sqrt((1 - [tex]z^2)/9)))[/tex]
y = ±sqrt((1 - z^2)/9)
z = t
This is defined for all t except at z = ±1.
b) To find the curve of intersection of the two surfaces x = y and [tex]x^2 - y^2 = z:[/tex]
We can substitute x = y into the second equation:
[tex]x^2 - y^2 = z[/tex]
[tex]y^2 - y^2 = z[/tex]
z = 0
So the curve of intersection is just the x = y line.
A parametrization for this line is:
x = t
y = t
z = 0
c) To find a parametrization for the surface [tex]x^2 + y^2 + z = 1:[/tex]
We can use cylindrical coordinates:
x = r cos(t)
y = r sin(t)
z = 1 - r
where 0 ≤ r ≤ 1 and 0 ≤ t < 2π.
This parameterization covers the surface of a unit cylinder with its top and bottom caps removed.
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The owner of a company asks a manager, "How many hours does an employee work each week?" a. Is this a statistical question? Explain. The question a statistical question because there. Question 2 b. The manager records the number of hours worked each week by several employees. Display the data in a dot plot. Identify any clusters, peaks, or gaps in the data. Hours worked 40 39 40 39 47 38 41 37 40 41 40 43 40 41 40 38 40 42 40 42 Most of the data are clustered around. There is a peak at and a gap between. Question 3 c. Use the distribution of the data to answer the question. Most employees work about hours each week
This is a statistical question because it involves collecting data. Most employees work around 40 hours each week.
a. This is a statistical question because it involves collecting data on the number of hours worked by employees each week and analyzing the distribution or pattern of the data.
b. Here's a dot plot of the data provided:
37: •
38: ••
39: ••
40: ••••••••
41: •••
42: ••
43: •
47: •
The distribution of the data in the dot plot shows that the majority of employees worked around 40 hours each week, as this is where the data is most heavily clustered. Most of the data are clustered around 40 hours, with a peak at 40 hours. There is a gap between 43 and 47 hours.
c. Based on the distribution of the data, most employees work about 40 hours each week.
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The tip of a pendulum swings through an arc whose length is 8 centimeters. If the radius of the pendulum is 26 centimeters, then what radian angle did the tip rotate through? Round your answer to the nearest hundredth
Answer: Therefore, the tip of the pendulum rotated through an angle of approximately 0.31 radians.
Step-by-step explanation:
The length of the arc traveled by the tip of the pendulum is 8 centimeters, and the radius of the pendulum is 26 centimeters. We can use the formula for the length of an arc of a circle to find the radian angle rotated through:
Length of arc = radius * angle in radians
Solving for the angle in radians, we get:
Angle in radians = Length of arc / radius
Plugging in the given values, we get:
Angle in radians = 8 / 26
Simplifying this expression, we get:
Angle in radians = 0.30769...
Rounding this value to the nearest hundredth, we get:
Angle in radians = 0.31
Therefore, the tip of the pendulum rotated through an angle of approximately 0.31 radians.
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Use the differential dz to approximate the change that will be
observed in z = f (x, y) = 5/x^2 + y^2 as x changes from −1 to
−0.93 and y changes from 2 to 1.94.
To approximate the change in z = f(x, y) as x changes from −1 to −0.93 and y changes from 2 to 1.94, we can use the differential dz.
First, we need to find the partial derivatives of f with respect to x and y:
∂f/∂x = -10/x³(y²)
∂f/∂y = -10(x²)/y³
Then, we can use the following formula:
dz ≈ ∂f/∂x * Δx + ∂f/∂y * Δy
where Δx and Δy are the changes in x and y, respectively.
Substituting in the given values, we have:
Δx = -0.93 - (-1) = 0.07
Δy = 1.94 - 2 = -0.06
Using the partial derivatives we calculated earlier, we get:
dz ≈ (-10/-1.037³(2²)) * 0.07 + (-10((-1)²)/1.94³) * (-0.06)
dz ≈ -0.031
Therefore, the approximate change observed in z as x changes from −1 to −0.93 and y changes from 2 to 1.94 is -0.031.
To approximate the change in z using the differential dz, we first need to find the partial derivatives of z with respect to x and y. Given z = f(x, y) = 5/(x² + y²):
∂z/∂x = -10x/(x² + y²)²
∂z/∂y = -10y/(x² + y²)²
Now, we need to find the differential dz:
dz = (∂z/∂x)dx + (∂z/∂y)dy
Since x changes from -1 to -0.93, dx = -0.93 - (-1) = 0.07. Similarly, y changes from 2 to 1.94, so dy = 1.94 - 2 = -0.06.
Now, plug in the initial values of x and y (-1, 2):
∂z/∂x = -10(-1)/((-1)² + 2²)² = -10/25
∂z/∂y = -10(2)/((-1)² + 2²)² = -40/25
Now, plug in dx and dy into the dz equation:
dz = (-10/25)(0.07) + (-40/25)(-0.06) = 0.28 - 0.096 = 0.184
So, the approximate change in z when x changes from -1 to -0.93 and y changes from 2 to 1.94 is 0.184.
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1. bona drives tor 3 hours at 44mph. clare drives 144 mies in 4 hours. how
for would bena travel if she drove for 3 hours at the same speed os
claire
2. janet and andrew leave their home at the same time. janet has 60
milles to travel and drives at 40 mph. andrew have 80 miles to travel
and also drives at 40 mph
a) how long does janets journey take?
(b) how much longer does andrew spend driving than janeta
1) Bona can drive 108 miles if she drove for 3 hour at the same speed as Claire.
2) Janet would take 1.5 hour to complete the journey and Andrew spend half hour more driving than Janet.
1) Bona speed is 44mph
Time taken by Bona is 3 hour
distance travelled by Claire is 144 miles
Time taken by Claire is 4 hour
Claire's speed = distance / time
Claire's speed = 144/4
Claire's speed = 36 mph
Distance travelled by Bona = speed × time
Distance travelled by Bona = 36 × 3
Distance travelled by Bona = 108 miles
2) Janet distance = 60 miles
Janet speed = 40 mph
Time taken by Janet = distance / speed
Time taken by Janet = 60/40
Time taken by Janet = 1.5 hour
Janet would take 1.5 hour to complete the journey
Andrew distance = 80 miles
Andrew speed = 40 mph
Time taken by Andrew = distance / speed
Time taken by Andrew = 80/40
Time taken by Andrew= 2 hour
Andrew spend half hour more driving than Janet.
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Tables
Contingency Tables
10. In recent years, concerns have been expressed about adverse health effects from amalgam
dental restorations, which contain mercury. The table shows results from a study in which
some patients were treated with amalgam restorations and others were treated with composite
restorations that do not contain mercury. Use a 0. 01 significance level to find the critical value
needed to test for independence between the type of restoration and sensory disorders.
Adverse health
condition reported
No adverse health
condition reported
01136
Amalgam
36
231
Composite
28
239
(1 poin
The critical value needed to test for independence between the type of restoration and sensory disorders is 6. 635.
How to find the critical value ?To evaluate the correlation between sensory impairments and restoration type, a chi-square test of independence can be used. To determine the critical value for this statistical test, consult the chi-square distribution table at a 0.01 significance level.
The degrees of freedom for a chi-square test of independence :
Degrees of Freedom ( df ) = ( Number of Rows - 1 ) x ( Number of Columns - 1 )
The number of rows from the table = 2
Number of columns is also = 2
The df is therefore:
df = (2 - 1) x (2 - 1) = 1 x 1 = 1
The critical value for χ² with 1 degree of freedom at a 0. 01 significance level can be founding using the Chi - Square table to be approximately 6.635.
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Full question is:
In recent years, concerns have been expressed about adverse health effects from amalgam dental restorations, which contain mercury. The table shows results from a study in which some patients were treated with amalgam restorations and others were treated with composite restorations that do not contain mercury. Use a 0. 01 significance level to find the critical value needed to test for independence between the type of restoration and sensory disorders.