Answer:
32ft^3
Explanation:
All sides of a cube are in equal lengths. So using your equation 4s^3, you can substitute s for 2 because one side of a locker is 2 feet long.
4(x)^3
4(2)^3
4(2•2•2)
4(8)
=32
The total volume of all four lockers is 32 cubic feet.