assume that a researcher wants to select individuals from a population so that an equal number of people from different ethnic groups (e.g., african-american, hispanic, asian-americans) are selected. the procedure the researcher would use is called

Answer:

p = 7

Step-by-step explanation:

2(p+1)=16

Distribute to get 2p+2=16

Subtract both sides by 2 to get 2p=14

Divide both sides by 2 to get p=7

Answer:

p = 7

Step-by-step explanation:

2 (p+1)=16

2p + 2 = 16

2p = 14

p = 14/2

p = 7

The value today of a money machine is $4,712.25. The value of the investment is $31,323.15.

Question 9:

To calculate the present value of the money machine, we can use the formula for the present value of an ordinary annuity:

PV = P * [(1 - (1 + r)^(-n)) / r],

where PV is the present value, P is the annual payment, r is the interest rate per period, and n is the number of periods.

Given:

Annual payment (P) = $1000,

Interest rate per period (r) = 4% = 0.04,

Number of periods (n) = 6 - 2 = 4.

Plugging in the values, we get:

PV = $1000 * [(1 - (1 + 0.04)^(-4)) / 0.04] = $4712.25.

Therefore, the value today of the money machine is $4712.25.

Question 10:

To calculate the present value of the investment, we can use the formula for the present value of a perpetuity:

PV = P / r,

where PV is the present value, P is the periodic payment, and r is the interest rate per period.

Given:

Periodic payment (P) = $500,

Interest rate per period (r) = 12% / 12 = 0.12 / 12 = 0.01.

Plugging in the values, we get:

PV = $500 / 0.01 = $31,500.

Therefore, the value of the investment today is $31,323.15.

In summary, the value today of the money machine that will pay $1000 per year for 6 years is $4712.25, and the value of the investment that will pay $500 per month starting four years from today and continue indefinitely is $31,323.15.

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The dimensions of the rectangle has a width = 12cm and length = 5cm.

In calculating the area of a rectangle, we multiply its length and width.

Let us use the letter x to represent the width, so that the length = x - 7

hence we calculate for the unknown x as follows;

x(x - 7) = 60

expand and equate to zero to derive a quadratic equation

x² + 7x - 60 = 0

by factorisation;

x² - 12x + 5x - 60 = 0

x(x - 12) +5(x -12) = 0

(x + 5)(x - 12) = 0

thus for x + 5 = 0

x = -5

and for x - 12 = 0

x = 12

Therefore, x = 12 is true for the quadratic equation and also for the width = 12 and length = 5cm for the rectangle.

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Use the rule, “add 8” to find the cost of 6 T-shirts. The cost of the T-shirt is $48.

One of the four fundamental operations in mathematics is addition, along with subtraction, multiplication, and division.

We see that the price of headbands changes abruptly, going from 0 to 2, then to 4, then to 6, etc., always increasing by 2 units.

The “add 8” rule applies to the price of T-shirts because each one costs $8.

In order to determine the cost of six headbands, we then perform the following calculations:

8 + 8 + 8 + 8 + 8 + 8 = 6 x 8 = $48

We see that we can easily multiply the required quantity of T-shirts by the cost per unit of T-shirts.

Therefore, the cost of the T-shirt is $48.

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The question is incomplete, the complete question is given below:

The school store sells headbands for $2 each and T-shirts for$8 each. Write ordered pairs to compare the cost of headbands to T-shirts for 0,1,2,3,4, and 5 of each item.

Cost of Headbands ($)

0

2

4

6

8

10

​

Cost of T-shirts ($)

8

16

24

32

40

Ordered Pairs

(0, 0)

(2, 8)

(4, 16)

(6, 24)

(8, 32)

(10, 40)

​

Answer:

a^4b^2

Step-by-step explanation:

s represents one side, or a^2b

so if s^2=A and s=a^2b then A=(a^2b)^2 or a^4b^2

Answer:

76.5

Step-by-step explanation:

if the area is 76.5^2, then all you have to do is take the square root, and it is 76.5

The equation of P in the given equation is P = 100N/W

The equation is given as:

W = 100N/P

Multiply both sides by P

WP = 100N

Divide both sides by W

P = 100N/W

Hence, the equation of P in the given equation is P = 100N/W

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The probability that the tennis player serves exactly two aces out of five serves is given by the expression 5C2 × p² × (1 - p)³, where p is the probability of serving an ace. The above expression is based on the concept of Bernoulli trials.

We are required to find the probability that the tennis player serves exactly two aces out of five serves. Let us assume that p is the probability of serving an ace. Hence, the probability of not serving an ace is 1 - p. The probability that he serves exactly two aces out of five serves is equal to the probability of serving two aces and not serving the other three aces. Hence, the probability can be calculated as follows:

P (2 aces out of 5 serves) = P (AA NNN) = P (AA) × P (NNN) = p² × (1 - p)³

In this case, n = 5. We are required to choose r = 2 aces out of the 5 serves. Hence, the number of combinations is 5C2. Hence, the probability of serving exactly two aces out of five serves is:

P (2 aces out of 5 serves) = 5C2 × p² × (1 - p)³

The given problem can be solved using the concept of Bernoulli trials. A Bernoulli trial is a statistical experiment that can result in only two possible outcomes, which are labeled as Success or Failure. In this case, serving an ace is considered as a Success and not serving an ace is considered as a Failure. The outcomes of the trials are independent and the probability of success is constant.Let us assume that p is the probability of serving an ace. Hence, the probability of not serving an ace is 1 - p. The probability that he serves exactly two aces out of five serves is equal to the probability of serving two aces and not serving the other three aces. Hence, the probability can be calculated as follows:

P (2 aces out of 5 serves) = P (AA NNN) = P (AA) × P (NNN) = p² × (1 - p)³In this case, n = 5. We are required to choose r = 2 aces out of the 5 serves. Hence, the number of combinations is 5C2. Hence, the probability of serving exactly two aces out of five serves is:P (2 aces out of 5 serves) = 5C2 × p² × (1 - p)³The above expression is the answer to the given problem. We can substitute the given value of p to obtain the numerical value of the probability. If p is not given, we can use the data from a large number of trials to estimate the value of p. In such a case, we can use the concept of the Law of Large Numbers, which states that the average of the results obtained from a large number of trials should be close to the expected value. Hence, we can use the empirical data to estimate the value of p and then substitute it in the above expression to obtain the required probability.

The probability that the tennis player serves exactly two aces out of five serves is given by the expression

5C2 × p² × (1 - p)³, where p is the probability of serving an ace. The above expression is based on the concept of Bernoulli trials. We can use the empirical data to estimate the value of p if it is not given in the problem. The Law of Large Numbers states that the average of the results obtained from a large number of trials should be close to the expected value. Hence, we can use the empirical data to estimate the value of p and then substitute it in the above expression to obtain the required probability.

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The question is asking us to make the denominator a rational function by finding a way to remove the square root without changing the value of the overall function.

We can do this by multiplying the denominator and numerator by the √(4x + 7), since multiplying a root term by that root term = the number being rooted  (√x × √x = x).

   - 5x⁴         ×      √(4x + 7)    =    (-5x⁴)(√(4x + 7))  

√(4x + 7)              √(4x + 7)                 4x + 7

There will be $33434.8 in the account after 9 years

From the question, we have the following parameters that can be used in our computation:

Principal, P = 18000

Time = 9 years

Rate = 7%

Number of times = 2

The formula for calculating the amount in an account is

A = P * (1 + r/2)^(2t)

So, the amount in the account after 9 years will be:

A = $18000 * (1 + 0.07/2)^(2 * 9)

Evaluate

A = $33434.8

Hence, after 9 years there will be $33434.8 in the account.

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Answer: B. 1/5

Step-by-step explanation:

The correctanswer is-the percentage of the pieces that will meet the length specs is 98.78%.

The given data may be a random variable that takes after the normal distribution with mean μ=64 and standard deviation σ=0.1

The required value is to discover the rate of the pieces that will meet the length specs which is between 63.76 and 64.24 inches.

To find the required percentage, standardize the given limits as follows: Lower Limit: (63.76 - μ) / σ= (63.76 - 64) / 0.1 = -2.4

Upper Limit: (64.24 - μ) / σ= (64.24 - 64) / 0.1 = 2.4

Using the Standard Normal Distribution Table, the probability that the value will fall between -2.4 and 2.4 is found to be 0.9878.

The required percentage is then found by multiplying the probability by 100, which is: Percentage = 0.9878 x 100% = 98.78%

Therefore, the percentage of the pieces that will meet the length specs is 98.78%.

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Answer:

-a^12bc

Step-by-step explanation:

-a^3b^2c = -a^6bc

-a^6bc^2 = -a^12bc

To test the hypothesis that the mean weight of two sheets is equal (μ1 - μ2) against the alternative that it is not, and assuming equal variances, we can use a two-sample t-test. The t-statistic can be calculated using the following formula:

t = (x1 - x2) / (s_p * sqrt(1/n1 + 1/n2))

where:

x1 and x2 are the sample means of the two sheets,

s_p is the pooled standard deviation,

n1 and n2 are the sample sizes.

The pooled standard deviation (s_p) can be calculated using the following formula:

s_p = sqrt(((n1 - 1) * s1^2 + (n2 - 1) * s2^2) / (n1 + n2 - 2))

where:

s1 and s2 are the sample standard deviations.

To calculate the t-statistic, we need the sample means, sample standard deviations, and sample sizes.

Once you provide the specific values for these variables, I can assist you in calculating the t-statistic to 3 decimal places.

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To test the hypothesis that the mean weight of the two sheets is equal (μ1 - μ2) against the alternative that it is not, we can use a paired t-test assuming equal variances. The paired t-test is used when we have paired data or measurements on the same subjects or objects.

The t-statistic for a paired t-test is calculated as follows:

t = (X1 - X2) / (s / √n)

where X1 and X2 are the sample means of the two samples, s is the pooled standard deviation, and n is the number of pairs.

Please provide the sample means, standard deviation, and sample size for each sheet so that we can calculate the t-statistic to 3 decimal places.

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Rounding up to the nearest unit, it would take Calvin approximately 27 months to pay off his credit card with a monthly payment of $165.

To determine how long it would take Calvin to pay off his credit card, we need to consider the monthly payment amount and the interest rate. Let's calculate the time it would take for two different monthly payment amounts: $220 and $165.

a. Monthly payment of $220:

Let's assume the initial balance on Calvin's credit card is $3,000, and the annual interest rate is 4 percent. To calculate the monthly interest rate, we divide the annual interest rate by 12 (number of months in a year):

Monthly interest rate = 4% / 12 = 0.3333%

Now, we can calculate the time it would take to pay off the credit card using the monthly payment of $220 and the monthly interest rate. We'll use a formula for the number of months required to pay off a loan with fixed monthly payments:

n = -(log(1 - (r * P) / A) / log(1 + r))

Where:

n = number of months

r = monthly interest rate (as a decimal)

P = initial balance

A = monthly payment

Plugging in the values:

n = -(log(1 - (0.003333 * 3000) / 220) / log(1 + 0.003333))

Using a calculator, we can find:

n ≈ 15.34

Rounding up to the nearest unit, it would take Calvin approximately 16 months to pay off his credit card with a monthly payment of $220.

b. Monthly payment of $165:

We can repeat the same calculation using a monthly payment of $165:

n = -(log(1 - (0.003333 * 3000) / 165) / log(1 + 0.003333))

Using a calculator, we find:

n ≈ 26.39

Please note that these calculations assume that Calvin does not make any additional charges on his credit card during the repayment period. Additionally, the interest rate and the balance are assumed to remain constant. In practice, these factors may vary and could affect the actual time required to pay off the credit card balance.

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 profit in each item will be 2.5

Answer:

20%

Step-by-step explanation:

Let's say that the 10 items cost $1 each. That would mean you spend $10.

As of that, the cost of 8 items (selling price) is also $10, meaning that you would spend $1.20 to buy the item

($1.20 - $1)/($1) = .20/1 = 1/5 = 20%

Answer:

1/8

Step-by-step explanation:

y =kx where k is constant

so k = 1/8

Answer: a. $10.27

b. $168.27

Step-by-step explanation:

From the question, we are informed that Brandan found two pairs of shorts for $35 each and four shirts with an average price of $22 per shirt. The cost of the shirts and shorts will be:

= (2 × $35) + (4 × $22)

= $70 + $88

= $158

A. If he buys all of the items how much sales tax will he have to pay?

Sales tax = 6.5% × $158

Sales tax = 0.065 × $158

Sales tax = $10.27

B. What is the total cost of his purchase including sales tax?

This will be:

= $158 + $10.27

= $168.27

Answer:

The GCF is 9

Step-by-step explanation:

9=1,3,9

18=1,2,3,6,9,18

The volume of the solid of intersection is V = (2/3) × 2πr³ = V = (4/3)πr³.

To find the volume of the solid of intersection of the two right circular cylinders of radius r whose axes meet at right angles, we can use the formula:

V = (2/3)πr³

where r is the radius of the cylinders.

First, we need to find the height of the intersection. Since the axes of the cylinders meet at right angles, the height of the intersection will be equal to the diameter of each cylinder. So, the height of the intersection will be 2r.

Now, we can find the volume of the solid of intersection by multiplying the area of the base (which is a circle of radius r) by the height of the intersection (2r):

V = πr²(2r)

Simplifying this equation, we get:

V = 2πr³

So, the volume of the solid of intersection of the two right circular cylinders of radius r whose axes meet at right angles is 2/3 of the total volume of a cylinder with radius r and height 2r, which is 2πr³.

Therefore, the volume of the solid of intersection is:

V = (2/3) × 2πr³
V = (4/3)πr³

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Answer:

option A

Step-by-step explanation:

Option A is 1,050 in total

option B is 1,400 in total

option C is 1,100 in total

that's my go at it

Answer:

4−2x<−3

Step-by-step explanation:

check:

now --- 4°

after 1 hr --- 2°

after 2 hrs--- 0°

after 3 hrs--- -2°

after 4 hrs--- -4°

so between 3 and 4 hrs it will reach -3°

4-2x < -3

-2x < -7

x > 3 1/2

Answer:

C)  S: {20, 40}

Step-by-step explanation:

Given inequality:

\(\dfrac{1}{5}(m-5)\leq \dfrac{1}{10}(m-20)\)

To solve the inequality, multiply both sides by 10:

\(\implies \dfrac{10}{5}(m-5)\leq \dfrac{10}{10}(m-20)\)

\(\implies2(m-5)\leq m-20\)

Expand the left side:

\(\implies 2m-10 \leq m-20\)

Subtract m from both sides:

\(\implies m-10 \leq -20\)

Add 10 to both sides:

\(\implies m \leq -10\)

Therefore, the true solution set to the given inequality are values of m that are less than or equal to -10.  

Therefore, the integers in the given set that make the inequality false are the values of m that are greater than -10:

A 95% confidence interval for percent of american adults who believe in aliens:  (0.6578, 0.7822)

In this question we have been given that in a survey conducted on an srs of 200 american adults, 72% of them said they believed in aliens

We need to find the 95% confidence interval for percent of american adults who believe in aliens.

95% confidence interval = (p ± z√[p(1 - p)/n])

Here, n = 200

p = 72%

p = 0.72

And the z-score for 95% confidence interval is 1.960

The upper limit of interval would be,

(p + z√[p(1 - p)/n])

= 0.72 + 1.960 √[0.72(1 - 0.72)/200]

= 0.72 + 1.960 √[(0.72 * 0.28)/200]

= 0.72 + 1.960 √0.001008

= 0.72 + 0.0622

= 0.7822

The lower limit of interval would be,

(p - z√[p(1 - p)/n])

= 0.72 - 1.960 √[0.72(1 - 0.72)/200]

= 0.72 - 1.960 √[(0.72 * 0.28)/200]

= 0.72 - 1.960 √0.001008

= 0.72 - 0.0622

= 0.6578

Therefore, a 95% confidence interval = (0.6578, 0.7822)

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Answer:

\(a*a*c*c=a^2×c^2\)

Step-by-step explanation:

Thanks!!!!!!!

loss = 279

lose petcent = 15%

Answer:

650

Step-by-step explanation:

800-250=650

It's like taking a negative number and adding a positive number to it

Answer:

36% ,hope this helps

Step-by-step explanation:

1) 100 - 85  = 15

2) 240 times 15 devided by:100

3) equals 36

4) 36 %