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1 year ago

The question is:

Mathematics

1 answer:

Naddik [55]1 year ago

7 0

Answer:

2.5 gallons of the 20% solution must be replaced by the 36% solution.

Step-by-step explanation:

$.12(20 - x) + .36x = 20(.15)$

$2.4 - .12x + .36x = 3$

$2.4 - .24x = 3$

$- .24x = - .6$

$.24x = .6$

$x = 2.5$

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2/3y + v = s solve for y

DanielleElmas [232]

Answer:

y = $\frac{3s-3v}{2}$

Step-by-step explanation:

Given

$\frac{2}{3}$ y + v = s ( subtract v from both sides )

$\frac{2}{3}$ y = s - v

Multiply through by 3 to clear the fraction

2y = 3s - 3v ( divide both sides by 2 )

y = $\frac{3s-3v}{2}$

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3 years ago

Solve the equation for (x) and simplify. (7X/6) = (5//2),x

Sunny_sXe [5.5K]

15/7 might be the answer I’m not sure

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2 years ago

You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on con

Assoli18 [71]

Question:

You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 5 years of the actual mean with a confidence level of 97% , how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 18 years.

Answer:

61.03

Step-by-step explanation:

Given:

Standard deviation = 18

Sample estimate = 5

Confidence level = 97%

Required:

Find sample size, n.

First find the Z value. Using zscore table

Z-value at a confidence level of 97% = 2.17

To find the sample size, use the formula below: