Volume

What you want to do here is use the fact that the surface area is 500cm² to solve for the length of a side of the cube or the radius of the sphere.

Then given those you can find the volume of each.

$\mbox{A cube has surface area }SA=6s^2 \mbox{where }s \mbox{ is the length of a side.} \\ \mbox{It has volume }V=s^3 \\ \mbox{ }\\ \mbox{A sphere has surface area }SA=4\pi r^2 \\ \mbox{It has volume }V=\dfrac 4 3 \pi r^3$

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