3 years ago

Solve the equation 3/y = 4/5

Mathematics

2 answers:

Alexeev081 [22]3 years ago

8 0

Answer:

15/4

Step-by-step explanation:

3/y=4/5

3=4/5(y)

3(5)=4y

15=4y

15/4=y

netineya [11]3 years ago

4 0

Step-by-step explanation:

<u>Step 1: Cross Multiply</u>

$\frac{3}{y} = \frac{4}{5}$

$5(3) = 4(y)$

$15 = 4y$

<u>Step 2: Divide both sides by 4</u>

$15 / 4 = 4y / 4$

$3.75 = y$

Answer: $y = 3.75$

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3 years ago

You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95% confidence lev

Vikentia [17]

Answer:

865

Step-by-step explanation:

We have that in 95% confidence level the value of z has a value of 1.96. This can be confirmed in the attached image of the normal distribution.

Now we have the following formula:

n = [z / E] ^ 2 * (p * q)

where n is the sample size, which is what we want to calculate, "E" is the error that is 2% or 0.02. "p" is the probability they give us, 5 out of 50, is the same as 1 out of 10, that is 0.1. "q" is the complement of p, that is, 1 - 0.1 = 0.9, that is, the value of q is 0.9.

Replacing these values we are left with:

n = [1.96 / 0.02] ^ 2 * [(0.1) * (0.9)]

n = 864.36

865 by rounding to the largest number.