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We identify this shape of this figure as a rectangular prism.
Recall the formula for the volume of a prism = V = (base area)*(height)
With base area = (length * width)
We want the length of this figure. We know height = 3 ft. width = 7 ft. Volume = 472.5 cubic ft.
472.5 = length * 3 * 7
472.5 = 21 * length
472.5 / 21 = length
length = 22.5 feet.
Answer choice D.) 22.5 feet.
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