<h3>
Answer: 228.68</h3>
Work Shown:

The volume is approximately 228.68 cubic feet.
The result is approximate because pi = 3.14 is approximate.
He has been adding pennies for 23 weeks. 161 / 7 = 23.
The correct one is multiplication.
-- Take the number of square miles.
-- Multiply it by the fraction (5,280 feet / 1 mile)² .
-- After canceling things where possible, simplifying, and
cleaning up the product, what you have is the same area
expressed in square feet.
75: 1, 3, 5, 15, 25, 75
90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
GCF(75, 90) = 1, 3, 5, 15
1 × 3 × 5 × 15
3 × 75
225