A plumber is laying pipe. His assistant digs a trench in roughly the shape of a rectangular solid measuring 150 ft. in length, 9 inches deep along both sides, and 12 inches wide at the top and bottom. How many cubic feet of earth did he remove (to the nearest tenth)?

Question

anonymous · Answer

1) is 150 ft * 1 ft * (9/12) ft, or 112.5 cubic feet.

2) Volume of the rod in cubic feet is 12 * pi * r^2, where r is the radius of the rod in feet, which is 1/24
= 0.0654 cubic feet * 490 lb/cu.ft
= 32 lb.
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