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:
The upper comment is correct
Since ur using r as a variable the answer is r = 7.
Answer:
6th square -2
8th square -3
9th square -8
Step-by-step explanation: The sum is -12
