To solve for the volume of the cube, you must use the formula:
Volume = a³
"a" being an edge.
Plug in 64 for Volume
64 = a³
Note the equal sign. What you do to one side, you do to the other. Cube root both sides
∛64 = ∛a³
a = ∛64 = 4
4 inches is your answer
hope this helps