Mrs. Baker conducted a survey in her classroom to determine what the students preferred to


do during the summer break. Her survey revealed that 21 out of 30 students preferred to go


swimming during the summer. If the school has a total of 1200 students, how many do


you


predict might enjoy swimming during the summer break? *


(5 Points)

The solution of the trigonometric equation

cos(2x) = cos(x) + 2

is x = 180°

Here we want to solve the equation:

cos(2x) = cos(x) + 2

First, we know that:

cos(2x) = 2cos(x)²  - 1

Then we can rewrite:

2cos(x)²  - 1 = cos(x) + 2

We can define:

cos(x)= y

2y² - 1 = y + 2

Then we need to solve the quadratic:

2y² - 1 - y - 2  =0

2y² - y - 3 = 0

Using the quadratic formula we will get:

[tex]y = \frac{1 \pm \sqrt{(-1)^2 - 4*2*2*-3} }{2*2} \\\\y = \frac{1 \pm 5}{4}[/tex]

so the solutions are:

y = (1 + 5)/4 = 6/4

y = (1-  5)/4 = -1

And remember that y = cos(x), then y =  6/4 can be discarded.

Then the solution comes from:

cos(x) = -1

then x = pi = 180°

Learn more about trigonometric equations at:

https://brainly.com/question/24349828

#SPJ1

The measure of angle zxy is 125 degrees.

To solve the problem, we can use the fact that the sum of the measures of two adjacent angles is 180 degrees. Let's call the measure of angle zxy "x".

We know that the ratio of m angle wxz to m angle zxy is 11:25, which means that:

m angle wxz : m angle zxy = 11 : 25

We can write this as an equation:

m angle wxz / m angle zxy = 11/25

We also know that the two angles are adjacent, so their measures add up to 180 degrees:

m angle wxz + m angle zxy = 180

Now we can use these two equations to solve for x:

m angle wxz / x = 11/25

m angle wxz = (11/25)x

Substituting this into the second equation:

(11/25)x + x = 180

(36/25)x = 180

x = (25/36) * 180

x = 125

Therefore, the measure of angle zxy is 125 degrees.

Learn more about adjacent angles,

https://brainly.com/question/28394984

#SPJ11

Answer:

39.27 square units

Step-by-step explanation:

In circle E with m∠DEF = 70∘ and DE=8, we want to find the area of sector DEF. To do this, we can use the formula for the area of a sector:

A_sector=1/2 r^2⋅

α

where r is the radius of the circle and α is the central angle in radians. In our case, r=8 and α=70 ∘ ⋅ π/180∘ = 7π/18 radians

Now, we can plug these values into the formula:

A_sector = 1/2(8^2) ⋅ 7π/18 = 32 ⋅ 7π/18 ≈ 39.27

So, the area of sector DEF is approximately 39.27 square units, rounded to the nearest hundredth.

The area of sector DEF in circle E is approximately 6.10 square units, rounded to the nearest hundredth.

To find the area of sector DEF in circle E, we need to use the formula for the area of a sector:

Area of sector = (Central angle / 360°) * π * r^2

where "Central angle" is the measure of angle DEF in degrees, "r" is the radius of the circle (DE in this case).

Given that m/DEF = 70° and DE = 8, we can calculate the area of sector DEF as follows:

Area of sector = (70° / 360°) * π * 8^2

Now, perform the calculations step by step:

Area of sector = (70/360) * π * 64

Area of sector = (7/36) * π * 64

Area of sector ≈ 3.14 * (7/36) * 64

Area of sector ≈ 3.14 * 1.9444

Area of sector ≈ 6.10 (rounded to two decimal places)

Therefore, the area of sector DEF in circle E is approximately 6.10 square units, rounded to the nearest hundredth.

To know more about circle:

https://brainly.com/question/12930236

#SPJ2

The complete relative frequency table include the following missing values:

Early bird Night Owl Total

Coffee. 0.21 0.44 0.65

Tea. 0.19. 0.16. 0.35

Total. 0.4. 0.6. 1

The total of each column is being determined from the grand total which can then be use to fill in the various missing parts of the relative frequency table.

For coffee;

To determine the total = 1-0.35 = 0.65

Coffee early Bird = 0.65-0.44 =0.21

For tea ;

Tea night owl = 0.35-0.19 = 0.16

For grand total = 1-0.6 = 0.4

Learn more about frequency here:

https://brainly.com/question/27151918

#SPJ1

A definite integral is defined as the signed area under a function between certain limits (bounds) of integration.

An indefinite integral represents the family of antiderivatives of a function and is also known as its general integral or antiderivative.

An indefinite integral represents the family of antiderivatives of a function and is also known as its general integral or antiderivative. An indefinite integral does not have specific limits of integration; its result includes a constant of integration (usually denoted +C), which accounts for all possible constant shifts within its antiderivative.

A definite integral is defined as the signed area under a function between certain limits (bounds) of integration. The real number that represents its net area between it and x-axis during an interval.

Read more on indefinite integral and definite integral here:https://brainly.com/question/27419605

#SPJ4

The intercept of 5.3 suggests that even if a mother had no income, the expected minimum fathers' income would be $5.30.

In mathematical terms, the equation y=1.23x+5.3 is in slope-intercept form, where y represents the fathers' incomes and x represents the mothers' incomes. The slope of the line, 1.23, represents the change in fathers' incomes for every one unit increase in mothers' incomes. The y-intercept of the line, 5.3, represents the minimum fathers' income when the mothers' income is zero.

With this equation, we can make several conclusions about this sample. Firstly, the positive slope suggests a positive correlation between the incomes of mothers and fathers. As the mothers' incomes increase, the fathers' incomes also tend to increase.

Secondly, the slope value of 1.23 suggests that fathers' incomes increase by $1.23 for every $1 increase in mothers' incomes.

To know more about equation here

https://brainly.com/question/10413253

#SPJ4

Answer:

f(-2) = 9

Step-by-step explanation:

f(x) = -3x + 3                  Solve for f(-2).

f(-2) = -3(-2) + 3

f(-2) = 6 + 3

f(-2) = 9

The transformation of f(x) to g(x) involves a horizontal shift and a reflection. The function g(x) is a transformed version of f(x) obtained by translating f(x) to the left by 2 units along the x-axis.

Specifically, to obtain g(x) from f(x), we first shift f(x) two units to the left, and then we take the absolute value of the result.

This means that the graph of g(x) will be the same as the graph of f(x) for all values of x greater than or equal to -2, but will be reflected across the y-axis for all values of x less than -2.

In other words, the transformation of f(x) to g(x) involves a horizontal shift and a reflection.

To know more about absolute value, refer here:

https://brainly.com/question/4691050#

#SPJ11

The volume of the cones are;

1. 84. 78 in³

2.  564. 15 ft³

3.  4710 yd³

The formula for calculating the volume of a cone is expressed as;

V = 1/3 πr²h

Given that;

From the information given, we have;

1. Volume = 1/3 × 3.14 × 3² × 9

Multiply the values and find the square

Volume = 254. 34/3

divide the values

Volume = 84. 78 in³

2. Volume = 1/3 × 3.14 × 7² × 11

Multiply the values

Volume = 1692. 46/3

Volume = 564. 15 ft³

3. Volume = 1/3 × 3.14 × 15² × 20

Multiply the values

Volume = 4710 yd³

Learn more about cones at: https://brainly.com/question/6613758

#SPJ1

Answer:

3y^3-9y^2+6y

Step-by-step explanation:

= 3y^3-9y^2+6y

Answer:

m = 1/2

Step-by-step explanation:

We Know

The slope of a line is the rise/run

Pick 2 points (0,1) (2,2)

We see the y increase by 1, and the x increase by 2, so the slope of the line is

m = 1/2

Point estimate of μ  [tex]26.15[/tex]

99% confidence interval: [tex](24.213, 28.087)[/tex]

Margin of error:[tex]1.437[/tex]

The point estimate of  (population mean) is calculated by finding the sample mean , which is the average of the given sample data. Adding up all the observations and dividing by the sample size (18), we get:

To make a 99% confidence interval for we can use the t-distribution and the sample mean. Since the sample size is 18, we have (18 - 1) = 17 degrees of freedom. Using a t-distribution table or a calculator, we find the critical value for a 99% confidence level and 17 degrees of freedom to be approximately 2.898.

Next, we calculate the standard error (SE) using the sample standard deviation (s) divided by the square root of the sample size .Assuming the population standard deviation is unknown, we estimate it using the sample standard deviation, which is approximately 3.858.

Learn more about population

brainly.com/question/15889243

#SPJ11

u = 28.8

The 99% confidence interval for μ is (27.01, 30.59).

28.4 + 27.3 + 25.5 + 25.5 + 31.1 + 23.0 + 26.3 + 24.6 + 28.4 + 37.2 + 23.9 + 28.7 + 27.9 + 25.1 + 27.2 + 25.3 + 22.6 + 22.7 = 518.3

The sample mean (or the point estimate of μ) is:

518.3 / 18 = 28.8

Calculate each data point's deviation from the mean, square it, and then sum up these values.

(28.4-28.8)² + (27.3-28.8)² + (25.5-28.8)² + (25.5-28.8)² + (31.1-28.8)² + (23.0-28.8)² + (26.3-28.8)² + (24.6-28.8)² + (28.4-28.8)² + (37.2-28.8)² + (23.9-28.8)² + (28.7-28.8)² + (27.9-28.8)² + (25.1-28.8)² + (27.2-28.8)² + (25.3-28.8)² + (22.6-28.8)² + (22.7-28.8)²

= 116.4

Divide by (n - 1), where n is the number of observations. In this case, n = 18, so n - 1 = 17.

So, the variance (s²) is 116.4 / 17 = 6.85 (approximately)

s = √6.85 = 2.62

CI = x ± (t * (s/√n))

CI = 28.8 ± (2.898 * (2.62/√18))

CI = 28.8 ± 1.79

So, the 99% confidence interval for μ is (27.01, 30.59).

Read more on confidence interval here https://brainly.com/question/15712887

#SPJ4

The value of the speed of the satellite in meters per second is,

⇒ Speed = 7.5 x 10³ m /sec

We have to given that;

A satellite orbiting Earth travels 4.95×10⁷ meters for each orbit.

And, It takes 6,600 seconds to make one orbit.

Hence, the speed of the satellite in meters per second is,

⇒ Speed = Distance / Time

⇒ Speed = 4.95×10⁷/ 6,600

⇒ Speed = 0.00075 x 10⁷

⇒ Speed = 7.5 x 10⁻⁴ x 10⁷

⇒ Speed = 7.5 x 10³ m /sec

Thus, The value of the speed of the satellite in meters per second is,

⇒ Speed = 7.5 x 10³ m /sec

Learn more about the scientific notation visit:

brainly.com/question/1767229

#SPJ1

The population of the world in 1955 based on the model q(t) = 2.500[tex]e^{0.0168t}[/tex] is 2.54 billion.

The model q(t) = 2.500[tex]e^{0.0168t}[/tex] represents the world population in billions

Here, t represents the years after 1955 and e is exponential constant its value is approximately 2.718.

Here the population is growing exponentially means population is growing at faster rate.

To find the population of the world in 1955 we will take

t = 1

on putting the value of t in the given function q(t)

q(t) = 2.500e[tex]e^{0.0168(1)[/tex]

on solving the function q(t) we get

q(t) ≈ 2.54

so, the population of the world in 1955 is 2.54 billion

To know more about population click here :

https://brainly.com/question/27991860

#SPJ4

The height of the house by the given data is 4000ft.

We are given that;

Number of BTUs for heating= 52000

Now,

The time from minutes to hours by dividing by 60:

t=606.24​ hr

t≈0.104 hr

Then, we can plug in the values into the heat loss formula and solve for A, which is the surface area of the house:

Q=UAΔTt

52,000=0.25A×50×0.104

A=0.25×50×0.10452,000​ ft2

A≈4000 ft2

Therefore, by the algebra the answer will be 4000 ft.

More about the Algebra link is given below.

brainly.com/question/953809

#SPJ1

Answer:3.75 BTUs/ft

height=18 ft

Step-by-step explanation:

This new function W(x) = 22 - (11/8) * (x - 16)² will model the shape of the arch with dimensions of 32 inches wide and 44 inches tall.

To modify the function W to model the new arch with dimensions of 32 inches wide and 44 inches tall, we need to adjust the formula to reflect the new proportions.

Currently, the function W is defined as:

W(x) = h/2 - h/(2a) * (x - a)²

Where h is the height of the arch and a is half of the width of the arch.

To modify the function for the new arch, we need to adjust the value of a to reflect the new width of 32 inches. Since a is half the width, we have:

a = 32/2 = 16

We also need to adjust the value of h to reflect the new height of 44 inches. Therefore, the new function for the arch would be:

W(x) = 44/2 - 44/(2*16) * (x - 16)²

Simplifying this expression, we get:

W(x) = 22 - (11/8) * (x - 16)²

This new function will model the shape of the arch with dimensions of 32 inches wide and 44 inches tall. The parabolic shape of the function will remain the same, but the specific coefficients in the function have been adjusted to reflect the new proportions of the arch.

Know more about function here:

https://brainly.com/question/12431044

#SPJ11

The average speed that your brother was traveling is approximately 45.63 miles per hour

The average speed is the total distance traveled divided by the total time taken. So we have:

Average speed = total distance ÷ total time

We are given the total distance as 115 miles and the total time as 2.52 hours. Therefore, the average speed is:

Average speed = 115 miles ÷ 2.52 hours

Average speed = 45.63 miles per hour

So, the average speed that your brother was traveling is approximately 45.63 miles per hour.

To learn more about average speed, click here:

https://brainly.com/question/12322912

#SPJ11

The scale factor is 7/5 or 1.4.

In order to determine the scale factor, we need to compare the corresponding sides of two similar figures. Let's begin by drawing a diagram to represent the given information:

         M ------- N

        /             \

       /               \

      A ---------------- C

       <-----25cm----->

   <-----20cm-----> <-----35cm----->

From the diagram, we see that triangle AMC is similar to triangle CNC, since they share angle C and have proportional sides:

Scale factor = corresponding side length in triangle CNC / corresponding side length in triangle AMC

We can calculate the scale factor by comparing the lengths of the corresponding sides:

Scale factor = NC / AM

Scale factor = 35 cm / 25 cm

Scale factor = 7 / 5

Learn more about scale factor

brainly.com/question/30215044

#SPJ11

Answer:

72 + 7x + 24 = 180

7x + 96 = 180

7x = 84

x = 12

The 95% confidence interval for the true proportion of families that own at least one television is (0.347, 0.542).,

The formula for the confidence interval of a proportion:

CI = p ± z* (√(p*(1-p)/n))

where:

p is the sample proportion (40/90 = 0.4444)

z* is the critical value of the standard normal distribution at the 95% confidence level (1.96)

n is the sample size (90)

Substituting the  values, we have

CI = 0.4444 ± 1.96 * (√(0.4444*(1-0.4444)/90))

CI = 0.4444 ± 1.96 * (√(0.00245))

CI = 0.4444 ± 1.96 * 0.0495

CI = 0.4444 ± 0.097

Hence, the 95% confidence interval for the true proportion of families that own at least one television is (0.347, 0.542) when rounded to three decimal places.

Learn more about standard normal distribution at: https://brainly.com/question/4079902\

#SPJ1

The total area of the first floor of the tiny house is 121 square feet

The total area of the first floor of the tiny house can be expressed as the sum of the areas of each room. The area of a rectangle is calculated by multiplying the length by the width. Therefore, we can write:

Total area = Area of kitchen + Area of bathroom

The area of the kitchen is given by the product of the length and the width of the kitchen, which is 11 feet and 7 feet, respectively. Therefore, the area of the kitchen can be written as:

Area of kitchen = 11 x 7 = 77 square feet

Similarly, the area of the bathroom is given by the product of the length and the width of the bathroom, which is 11 feet and 4 feet, respectively. Therefore, the area of the bathroom can be written as:

Area of bathroom = 11 x 4 = 44 square feet

Substituting these expressions into the equation for the total area, we get:

Total area = Area of kitchen + Area of bathroom

= 77 + 44

= 121 square feet

Therefore, the total area of the first floor of the tiny house is 121 square feet, which can also be expressed as the sum of the areas of the kitchen and bathroom.

To know more about area, refer to the link below:

https://brainly.com/question/22563096#

#SPJ11

The total area of the flag is the sum of the areas of the three stripes and the percentage of the flag that is gold is approximately 0.459%

Let's call this height "h".

We also know that the side lengths of the flag are in the ratio 2:3. This means that if the shortest side is 2x, then the longest side is 3x. Since the three stripes are of equal height, each one must be h/3 in height.

Now we can use this information to find the area of the gold-colored disk and the total area of the flag. The area of a circle is given by the formula A = πr^2, where r is the radius. Since the diameter is equal to the height of the center stripe (which is h/3), the radius of the disk is h/6. So the area of the disk is:

A_disk = π(h/6)^2 = πh^2/36

The total area of the flag is the sum of the areas of the three stripes. Since each stripe is h/3 in height and the shortest side is 2x, the area of each stripe is:

A_stripe = (2x)(h/3) = 2hx/3

So the total area of the flag is:

A_flag = 3(A_stripe) = 6hx

To find the percentage of the flag that is gold, we need to divide the area of the gold-colored disk by the total area of the flag and multiply by 100.

percentage = (A_disk / A_flag) x 100

Substituting our expressions for A_disk and A_flag, we get:

percentage = (πh^2/36) / (6hx) x 100

Simplifying, we can cancel out the factor of h and get:

percentage = (π/216)x100

So the percentage of the flag that is gold is approximately 0.459% (rounded to three decimal places).

To know more about total area, visit:

https://brainly.com/question/29261605#

#SPJ11

The maximum value represents (b) the point where most profits are made

Given that the graph is the graph of a company's profit

The maximum value represents (b) the point where most profits are made

Given that the graph is the graph of a company's profit

The x-intercept is when the profit = 0

So

The x-intercept represents (b) the price per pen where no profit is made

This is calculated as

Rate = [f(6) - f(3)]/[6 - 3]

So, we have

Rate = [0 - 120]/[6 - 3]

Rate = -40

The domain of this graph given the situation is (0, 6] because the values do not makes sense beyond those points

Read more about quadratic functions at

https://brainly.com/question/25841119

#SPJ1

Answer:

3

Step-by-step explanation:

We can see that in figure ABC, line segment AB is 5 ft.

We can also see that in figure DEF, line segment DE is 15 ft.

How did we get from 5 to 15?

We multiplied by 3, so the scale factor is 3.

Hope this helps! :)

The volume of granola a cylindrical container can hold 5451.6 cubic centimeters if containers have a diameter of 20 cm and a height of 17. 4 cm.

The number of unit cubes (cubes of unit length) that can fit inside a cylinder determines its volume.

Identifying the radius (r) and height (h)
r = 10 cm
h = 17.4 cm

Calculating the volume (V) using the formula V = πr²h
V = π × (10 cm)² × 17.4 cm
V ≈ 3.14 × 100 cm² × 17.4 cm
V ≈ 5451.6 cm³

Approximately, a container will hold 5451.6 cubic centimeters of granola.

To learn more about volume: https://brainly.com/question/463363

#SPJ11

A rectangular prism is a three-dimensional shape with six faces, all of which are rectangles. The volume of a rectangular prism can be found by multiplying the length, width, and height of the prism.

In this case, Sam's box has a height of 1/6 inches, a width of 1/3 inches, and a length of 1/2 inches. To find the volume, we need to multiply these three dimensions:

(1/6) x (1/3) x (1/2) = 1/36 cubic inches.

Therefore, the volume of Sam's box is 1/36 cubic inches, which is an improper fraction because the numerator is greater than the denominator.

To know more about rectangular prism refer here

https://brainly.com/question/21308574#

#SPJ11

If the scatter plot shows no discernible relationship between the variables and the points appear randomly scattered, then the r-value of 0.01 is accurate. However, if there is a visible relationship, the value of r may need to be recalculated or checked for errors in data input or analysis.

To find whether a correlation coefficient of r = 0.01 is an accurate value for the data based on the scatter plot, it's essential to consider the following factors:

1. Visual inspection of the scatter plot: Observe the overall pattern of data points in the scatter plot. If the points seem randomly scattered with no discernible pattern, then a correlation coefficient close to 0, such as r = 0.01, would be accurate. However, if there is a clear linear or non-linear relationship between the variables, the value of r = 0.01 may not be accurate.

2. Strength of the relationship: The correlation coefficient r ranges from -1 to 1, where -1 represents a strong negative relationship, 0 represents no relationship, and 1 represents a strong positive relationship. An r-value of 0.01 indicates a very weak or no relationship between the variables. Confirm that this is consistent with the scatter plot pattern.

To determine if the r-value of 0.01 is accurate for the data, carefully examine the scatter plot and consider these factors. If the scatter plot shows no discernible relationship between the variables and the points appear randomly scattered, then the r-value of 0.01 is accurate. However, if there is a visible relationship, the value of r may need to be recalculated or checked for errors in data input or analysis.

To know more about scatter plot refer here:

https://brainly.com/question/29231735

#SPJ11

Answer:

m = -2

Step-by-step explanation:

We Know

Slope = rise/run or (y2 - y1) / (x2 - x1)

Pick 2 points (-3,2) (-2,0)

We see the y decrease by 2, and the x increase by 1, so the slope is

m = -2

Using basic mathematical procedures, we can determine that the total cost of the 8 bags of popcorn and 5 drinks is $53.

An operation, in mathematics, is a mathematical function that transforms zero or more input values into a precisely defined output value.

The quantity of operands affects the operation's arity.

The rules that specify the order in which we should carry out the operations required to solve an equation are referred to as the order of operations.

PEMDAS stands for Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction. (from left to right).

The whole price is thus:

Popcorn costs $3.50 for one bag.

One beverage costs $5.

Total cost for 5 beverages and 8 bags of popcorn:

(8 × 3.50) + (5 × 5) 28 + 25 $53

Therefore ,Using basic mathematical procedures, we can determine that the total cost of the 8 bags of popcorn and 5 drinks is $53.

To know more about mathematical operations visit:

brainly.com/question/28362686

#SPJ1

The appropriate response is provided below:

Zahra is going to the cinema with a few of her friends. A bag of popcorn costs $3.50 and a drink costs $5 at the theatre. How much would it cost if they purchased 5 beverages and 8 bags of popcorn?

This requires an online learning algorithm that adapts to the changing costs of each expert and helps us make optimal choices

In this scenario, we can think of the slot machines as experts providing us with advice on which machine to play each day. The cost of taking advice from each expert, represented by cti, is the amount we lose by playing that particular machine.

To minimize our losses and regret, we want to choose the expert (i.e., slot machine) with the lowest cost each day. However, it's important to note that the cost of taking advice from each expert may change each day, so we need to constantly evaluate and adjust our choices.

To formalize this problem as an optimization task, we can use the concept of regret. Regret measures how much worse off we are by not knowing the best expert in advance. In other words, it's the difference between our cumulative losses if we always chose the best expert versus the losses we actually incur by following different experts each day.

To minimize our regret R, we need to choose the best expert as often as possible. One way to achieve this is by using an online learning algorithm that updates our choice based on the outcomes of each day's play. By continuously monitoring the performance of each slot machine, we can adjust our strategy and minimize our losses over time.

In summary, to minimize our losses while gambling at a casino, we need to treat each slot machine as an expert providing us with advice. We must choose the expert with the lowest cost each day and constantly update our strategy to minimize regret.

This requires an online learning algorithm that adapts to the changing costs of each expert and helps us make optimal choices.

To know more about algorithm refer here

https://brainly.com/question/31936515#

#SPJ11