If the length is 15 and it is a cube than that means that the other sides are going to be the same length. The formula for the volume of a cube is V = Bh, B is base times height, or you can also write it as V = s*s*s, side times side times side. Another way for it would be V = s³.
s * s * s = B * h = V
15 * 15 * 15 = 225 * 15 = 3375
Your final answer is the volume of the large cube is 3375 ft³.
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