To find the volume of a cube, you can use the formula for the surface area of a cube:
Surface area = 6 * side length^2
In this case, the surface area of the cube is 96ft², so you can set up the equation:
96ft² = 6 * side length^2
Solving for side length gives:
side length = sqrt(96ft² / 6) = 4ft
The volume of the cube is side length^3, so the volume of the cube is 4ft^3 = 64ft^3.
Therefore, the correct answer is C) 84.06ft³.