Answer:
Part a) The area of the pool is

Part b) The area of the pool and the walkway is

Explanation:
we know that
The area of the rectangle is equal to

where
L is the length side
W is the width side
Part a) What is the area of the pool?
we have


substitute the values

Part b) What is the area of the pool and the walkway?
we have


substitute the values
