Erika would need 1,599.36 cubic feet of topsoil.
In order to determine the cubic feet of topsoil, the volume of the front yard has to be determined.
Volume = length x width x height
The dimensions of the depth has to converted to feet
1 inch= 0.0833 feet
4 inches x 0.0833 = 0.3332
Volume = 60 x 80 x 0.0332 = 1,599.36 cubic feet
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