This is the same as saying 27 cubic inches
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Explanation:
We get the volume of a cube by using the formula
V = s^3
where the cubed exponent is directly tied together with the idea of volume being in cubic units. In this case, s = 3 which leads to
V = s^3
V = 3^3
V = 3*3*3
V = 27 cubic inches
As another example, let's say s = 4. That means
V = s^3
V = 4^3
V = 4*4*4
V = 64
We multiply the side length by itself having three copies total. This formula only applies to cubes. A more generalized formula for rectangular blocks is V = L*W*H where L,W,H are the length width and height in that order. This generalized formula allows for side lengths to be different, but if L = W = H, then it makes more sense to go with the first formula instead.