Using the formula for the volume of a rectangular prism, the volume of mulch Rachel needs is: A. 10.5 cubic feet.
What is the Volume of a Rectangular Prism?
Volume = length × width × height
The rectangular beds are prism considering the depth of mulch the surrounding would be filled with.
3 inches = 0.25 ft
Volume of mulch Rachel needs = Volume of the 13 ft by 6ft rectangular area - 3(volume of a rectangular prism bed of height 3 inches)
= 13 × 6 × 0.25 - 3(4 × 3 × 0.25)
Volume of mulch Rachel needs = 10.5 cubic feet.
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