Answer:
The correct answer is (E).
This is not an experiment because no treatment is being imposed upon the customers. Additionally, this study used a stratified sample because independent random samples were selected from two distinct populations of customers.
Step-by-step explanation:
Answer:
21
Step-by-step explanation:
Answer:
We first must solve for x

When we have x, we put it in to the second equation

If I remember My geometry correctly
you add GH AND EF then divide 2
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