Hi, I'm having trouble with how to do this question. It's quite simple but for some reason I'm not doing it right... Here it is: The exact edge length of a cube is $\displaystyle (\frac{5}{2})^{-2/3}$ units. Determine the volume of the cube.

I know that the volume is equal to (side length x side length x side length) or in other words (side length) cubed. However, i can't get the same answer as the book states which is: $\displaystyle \frac{4}{25}$ cubed. I started out by cubing (^3) the whole side length but somehow ended up with the wrong answer.

If someone could show me the steps in doing this so i can find out where i went wrong, that would be great! THANKS!