You built a retaining wall 45 feet long with a 12-inch-wide footer. You needed 7 inches of crushed stone in the bottom and then 3 inches of stone dust. On top of the stone dust you needed 6-inch stones which you used for the wall. The top of the stones is even with the ground.
a. How deep is the footer?
b. How many cubic feet of dirt were removed?
c. How many cubic feet of crushed stone were needed?
d. How many cubic feet of stone dust were needed?
e. How many 15-inch-wide stones were needed for the footer?
a. 16 in
b. 60 ft3
c. 26.25 ft3
d. 11.25 ft3
e. 36 stones
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