Answer:
Explanation:
The volume of dirt removed can be calculated by multiplying the length, width, and depth of the trench. First, we need to convert the depth from feet and inches to feet.
3-1/2 ft = 3.5 ft
The volume of dirt removed is:
V = length x width x depth
V = 81 ft x 4 ft x 3.5 ft
V = 1134 cubic feet
Therefore, 1134 cubic feet of dirt was removed from the trench.