You multiply fractions simply by multiplying numerators and denominators with each other:

Step-by-step explanation:
y = 28
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Answer:
y = -5/2x + 1
Step-by-step explanation:
y=mx+b
m is slope
b is y intercept
Answer:
Stratified sampling
Step-by-step explanation:
Given


Required
The type of sampling method
From the question, we understand that, the sample are divided into two categories. This means that each person in each person do not have the same probability of being selected.
<em>Such method is a stratified sampling</em>