Short answer b 7m
Very simple just do the math mostly multiplying
Lisa walked 16 tim walked 8
Answer:
The surface area of the structure is 
Step-by-step explanation:
we know that
The surface area of a sphere is equal to

In this problem we have
-----The radius is half the diameter
substitute


Factor the expression and your answer would be
- (5xy + 16x - 26y)
hope this helps