-13 = \(\frac{r}{9}\) +8

what is r?

Add up the number of students within the random sample data:
32+26+28+22 = 108

We can then use proportional fractions / cross-multiply to answer the question.

In a sample size of 108 students, 32 of them preferred Movie A.
There are 900 students in total.

\(\frac{32}{108} =\frac{x}{900}\)

32*900 = 28800

108*x = 108x

108x = 28800

x = \(266\frac{2}{3}\) or \(\frac{800}{3}\)

In decimal form that is approximately 266.667 and round that to the nearest whole number, you get 267 students who would prefer Movie A.

Profit fall in one year = 116.8$

What is profit?

In accounting, a profit is an income that is given to the owner throughout a successful market producing process. Profitability, which is the owner's primary interest in the income-formation process of market production, is measured by profit. There are several profit metrics that are frequently used.

Let cost price = C

And selling price before reducing = S

Profit for 1 day = S-C

Now, After reducing selling price to = S-0.32

Profit= S - 0.32 - C for 1 day

Profit fall by = (S-C)-(S - 0.32 - C)

                     = S - C - S + 0.32 + C

Profit fall by = 0.32 for 1 day

Profit fall by one year = 0.32×365

                                    = 116.8$

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Answer:

The profit from each picture frame = $1.25

Step-by-step explanation:

The buying price for each picture frame = $5

As Jessie marks them up 25%.

Selling price = 5 + (25% × 5)

                     = 5 + (0.25 × 5)

                     = 5 + 1.25

                     = 6.25

As the selling price of each frame = $6.25

Buying price = $5

Thus, profit = selling price - buying price

                   = $6.25 - $5

                    = $1.25

Therefore, the profit from each picture frame = $1.25

Answer:

50 miles per hour!

Step-by-step explanation:

If 2 hours equal 100 miles, then 1 hour will be 50!

Hope this helped!

Answer:

speed = distance ÷ time

speed = 100 ÷ 2 = 50

= 59 mph

Step-by-step explanation:

just did the assignment on the edge

Answer: 48 stard

Step-by-step explanation:

12 stars = 30 balloons

? = 120 balloons

Solve

120/30 x 12 = 48

Answer:

48 stars

Step-by-step explanation:

This is an equation where you have to find an equivalent fraction.

So, it is given to us that 12/30 = something (x) /120.

So, what happened to 30 to make it 120 in the respective denominators? It was multiplied by 4.

So, that’s what you do to the numerator, multiply it by 4.

So 12 x 4 = 48.

Now put it back as a fraction 12/30 = 48/120

The 90% confidence interval for the population mean (µ) is approximately (18.89, 22.11) hours.

To construct a 90% confidence interval for the population mean (µ). We'll be using the information provided: sample size (n) = 22, sample mean (X) = 20.5, and sample standard deviation (s) = 4.6. Since the population has a normal distribution, we can follow these steps:

1. Determine the appropriate z-score for a 90% confidence interval. Using a standard normal distribution table or a calculator, we find that the z-score is 1.645.

2. Calculate the standard error (SE) by dividing the standard deviation (s) by the square root of the sample size (n).

\(SE= \frac{s}{\sqrt{n} } = \frac{4.6}{\sqrt{22} }=0.979\)

3. Multiply the z-score by the standard error to obtain the margin of error (ME). ME = 1.645 × 0.979 ≈ 1.610.

4. Subtract and add the margin of error from the sample mean to find the lower and upper bounds of the confidence interval. Lower bound = X - ME = 20.5 - 1.610 ≈ 18.89. Upper bound = X + ME = 20.5 + 1.610 ≈ 22.11.

So, the 90% confidence interval for the population mean (µ) is approximately (18.89, 22.11) hours.

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Answer:

Step-by-step explanation:

2.75 x 10⁵ ) / (2.25 x 10² )= (2.75 / 2.25) x 10⁵⁻²= 1.2 x 10³ times .(That's 1,200 times as many.)

An equation that mode the relationship between thee two variable is y=2x+3 .

Let x represent the number of 6-month period worked

Let y represent the total number of paid vacation day

According to the question,

When he started work, he was given three paid day of vacation. For each six-month period he pay at the job, his vacation is increased by two day.

Each year has 2 six-month periods. After 4.4 years Roberto will have worked 8.8 six-month periods. He will have been given vacation days for each of the 8 whole working periods he has completed. x=8 y=2*8+3 y=19

An equation that mode the relationship between thee two variable is y=2x+3 (Total vacation time equals 2 days times x plus the 3 days he was given at the start).

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Answer:

30,000

Step-by-step explanation:

Answer:

332

Step-by-step explanation:

Since Dana had the closest guess with 325 people and Elijah had the second closest guess with 340 people we know that the actual number of guests is close to these values. Since Brady had the farthest guess then that means that the actual number of guests is higher than 325 and lower than 340. Therefore the actual number of guests can only be 332 as it is between Dana and Elijah's guesses but still favoring Dana, and also being farthest from Brady's guess.

The correct answer is Option C. A researcher might choose purposive sampling over systematic sampling for several reasons. One key reason is that purposive sampling allows the researcher to study a particular type of participant.

This means that the researcher can select individuals who possess specific characteristics or traits that are relevant to their study.

By handpicking participants, the researcher can ensure that the sample represents the specific population they are interested in studying, which is particularly useful when investigating rare or hard-to-reach populations.

On the other hand, systematic sampling involves selecting participants at regular intervals from a larger population.

This method may not provide the same level of control in selecting participants based on specific characteristics.

While systematic sampling can be more efficient in terms of time and cost, it may not be suitable for certain research objectives that require a targeted approach.

It is important to note that neither method is inherently cheaper or more expensive than the other, and the choice between them depends on the research objectives and the specific population under investigation.

Therefore, option A is incorrect.

Option B is also incorrect because external validity is still important in research regardless of the sampling method chosen.

Option D is also incorrect since researchers using purposive sampling must still specify their population of interest.

Thus, the correct answer is option C.

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Answer:

19200000000

Step-by-step explanation:

1000000000 is 10^9. Then that times 19.2 is 19200000000.

(Hope this helped and have a great day)

(please mark this brainliest)

Answer:

Option B is the best way to write the underlined parts of sentences 2 and 3.

Sentence 2: They have a special finish that helps.

Sentence 3: The finish helps the swimmer glide through the water.

Option B provides a clear and concise way to connect the two sentences and convey the idea that the special finish of the swimsuits helps the swimmer glide through the water. It avoids any ambiguity or redundancy in the language.

The correct ranking of the spheres according to the magnitude of the electric field they produce at point P (greatest first) is: 1 > 2 > 3. The answer is option C.

Since all three spheres have the same charge Q and radius, the magnitude of the electric field at point P due to each sphere is proportional to 1/d^2, where d is the distance between the center of the sphere and point P. Therefore, the sphere closest to point P will produce the greatest electric field at that point.

Assuming that the three spheres are arranged in a straight line with sphere 1 being the closest to point P and sphere 3 being the farthest, we can rank the spheres according to the magnitude of the electric field they produce at point P as follows:

Sphere 1 produces the greatest electric field at point P since it is the closest to it.

Sphere 2 produces the second greatest electric field at point P since it is farther away from point P than sphere 1 but closer than sphere 3.

Sphere 3 produces the smallest electric field at point P since it is the farthest from it.

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Answer:

beta increases

Step-by-step explanation:

Relational databases are heavily based on the mathematical concept of: Set Theory. The correct option is (A).

Relational databases are based on the principles of set theory, which deals with sets of elements and their relationships with each other. In a relational database, data is organized into tables, with each table representing a set of related data.

The tables are then related to each other through the use of keys, which allow for the establishment of relationships between different sets of data. The principles of set theory also govern the use of operations such as union, intersection, and difference, which can be used to manipulate the data in the tables.

Therefore, the mathematical concept of set theory is a fundamental part of the design and use of relational databases.

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Answer:

4

Step-by-step explanation:

Answer:x=4

Step-by-step explanation:

Divide 9 by both sides

The margin of error is 0.1415, where z is the critical value for the desired confidence level,

The margin of error can be calculated using the formula: Margin of error = z * (standard deviation / sqrt(n))

where z is the critical value for the desired confidence level, standard deviation is the population standard deviation (which can be estimated using the sample standard deviation), and n is the sample size.

For a 99.8% confidence level, the critical value is 2.967. Using the given values of x and n, we can calculate the sample proportion as 46/98 = 0.4694.

To estimate the population standard deviation, we can assume that the sample proportion is a good estimate of the population proportion, and use the formula:

standard deviation = sqrt(p*(1-p)/n)

where p is the sample proportion. Substituting the values, we get: standard deviation = sqrt(0.4694*(1-0.4694)/98) = 0.0519

Now we can plug in the values into the margin of error formula to get: Margin of error = 2.967 * (0.0519 / sqrt(98)) = 0.1415

Therefore, the margin of error is 0.1415.

It is important to note that the margin of error represents the amount by which the sample proportion may differ from the population proportion with a certain level of confidence.

It is also important to remember that the margin of error is not the same as the sampling error, which is the difference between the sample mean and the population mean.

The margin of error can be used to determine the sample size required for a given level of precision, or to compare different sample sizes to determine which is more likely to yield a representative sample.

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Step-by-step explanation:

There are 84% out of 225. First find 10%. To do that divide the number by 10, so 225 ÷ 10 = 22.5 Next, do 22.5 x 8. Then you have 80%. Now, all that is need ed is the 4%. To get that, divide 225 by 100. Multiply the answer by 4 to get the 4%. Add the 80% and the 4% to get your answer. I really hope this helps. answers

Also, since I am just helping, I am un able to give you straight answers. I hope this also helps with work in the future.

The slope of the tangent line to the polar curve r = 2 - sin(θ) at the point specified by θ = π/3 is -1/2.

To find the slope of the tangent line to the polar curve r = 2 - sin(θ) at the point specified by θ = π/3, we need to first find the derivative of r with respect to θ, and then evaluate it at θ = π/3.

Differentiating both sides of the polar equation with respect to θ, we get:

dr/dθ = d/dθ(2 - sinθ)

dr/dθ = -cosθ

So, the derivative of r with respect to θ is -cosθ.

Evaluating this derivative at θ = π/3, we get:

dr/dθ|θ=π/3 = -cos(π/3) = -1/2

Therefore, the slope of the tangent line to the polar curve r = 2 - sin(θ) at the point specified by θ = π/3 is -1/2.

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The mileage of Alyssa's car is a measure of how far the car has traveled per unit fuel.The best method and reasoning to calculate the gas mileage is: D. 243.8 miles ÷ 7.71 gallon s

​The mileage of Alyssa's car is a measure of how far the car has traveled per unit fuel.

The best method and reasoning to calculate the gas mileage is:

D. 243.8 miles ÷ 7.71 gallon s

because dividing a quantity with units of miles by a quantity with units of gallons gives a quantity with units of miles per gallon.

The mileage of the car is calculated by dividing the number of miles traveled by the amount of gas used.

mileage

= 243.8 /7.71

From the given parameters;

The unit of miles traveled is miles

The unit of gallons used is gallons

Because the miles traveled is divided by the gallons used, then the unit of the mileage would be miles per gallon

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A day is a unit of time and cannot be divided into a fraction,  Therefore Wesley would need to run for at least 5 days to meet his goal of 19 miles.

To find out how many days Wesley needs to run to meet his goal, we need to divide the total distance he wants to run (19 miles) by the distance he runs each day (4.2 miles):

19 miles ÷ 4.2 miles/day = 4.52 days

Since a day is a unit of time and cannot be divided into a fraction, Wesley would need to run for at least 5 days to meet his goal of 19 miles.

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Answer:

B

Step-by-step explanation:

If there is no association between two variables, then the slope of the regression line would be zero.

This means that there is no linear relationship between the two variables, and the value of one variable does not predict or influence the value of the other variable. In other words, the regression line would be a horizontal line with a slope of zero.

It is important to note that the absence of a linear relationship between two variables does not necessarily mean that there is no relationship between them.

There could be other types of relationships that are not captured by a linear model, such as nonlinear or non-monotonic relationships, or interactions between variables.

It is also possible that there is no relationship at all between the two variables. In any case, if there is no linear relationship, the slope of the regression line would be zero.

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Answer:

It

Step-by-step explanation:

Is true because if you didn’t, who know what would happen

Answer:

I did 700 - 15% times that answer by 6 and u get that big answer.

The required amount Ahmet needs to pay after 6 years is $1619.14.

Compound interest is the interest on deposits computed on both the initial principal and the interest earned over time.

Amount = principal[1 + r/n]ⁿᵃ

Principal = P rate= r Time =a  , n = compounding frequency

Here,

From the given data,
P = 700, r = 15% and t = 6 (n =1)

Now,
Amount = principal[1 + r/n]ⁿᵃ
Amount = 700(1 + 0.15)⁶
Amount = $1619.14

Thus, the required amount Ahmet needs to pay after 6 years is $1619.14.

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\(f(1) = -6\)

Given:

\(f(x) = \begin{cases} -(x +5)^2 &\text{for} &x \leqslant -3 \\ -2x -4 &\text{for} &-3 < x \leqslant 1 \\ 5 &\text{for} &x > 1 \end{cases}\)

\(f(1) = -2x -4 \space , \space x = 1 \\ f(1) = -2(1) -4 \\ f(1) = -2 -4 \\ f(1) = -6\)

Answer:

11 music lessons.

Step-by-step explanation:

We know that membership costs $165 and members pay $25 per music lesson.

So, we can write the following expression:

\(165+25m\)

The 165 represents the one-time membership fee and the 25m represents the cost for m music lessons.

We know that non-members pay no membership fee but their cost per lesson is $40. So:

\(40m\)

Represents the cost for non-members for m music lessons.

We want to find how many music lessons would have to be taken for the cost to be the same for both members and non-members. So, we can set the expressions equal to each other:

\(165+25m=40m\)

And solve for m. Let's subtract 25m from both sides:

\(165=15m\)

Now, divide both sides by 15:

\(m=11\)

So, at the 11th music lesson, members and non-members will pay the same.

Further Notes:

This means that if a person would only like to take 10 or less lessons, the non-membership is best because there is no initial fee.

However, if a person would like to take 12 or more lessons, than the membership is best because the membership has a lower cost per lesson than the non-membership.

And we're done!

The special two-item character sequence that represents special characters like \n is known as an Escape Sequence. So the option B is correct.

An escape sequence is a sequence of characters that does not represent itself when used inside a character or string literal, but is translated into another character or a sequence of characters. It is used to signal an alternative interpretation of a series of characters. Common examples are the escape sequences used in C/C++ and other programming languages, such as "\n" for newline, "\t" for tab, and "\\" for a backslash. So the option B is correct.

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The complete question is:

The special two-item character sequence that represents special characters like \n is known as a(n) ?

a. backslash code

b. escape sequence

c. Unicode spec

d. literal character