What is the surface area of the cube

There are six faces on the cube, each with a surface area of (4.5 m)^2 = 20.25 m^2. They add up to the amount given by the first selection.

Ifigured it out from watching a khan academy video , i am so sorry about the first answer. but i agree that x= 72. and now you can give the other person brainliest if you want.