If the surface area of a cube is 150 cm2, what is its volume?

Suface area =  6 * (edge length)^2

So

150  =  6 * edge length^2

150 / 6 = edge length ^2            take the  square root

sqrt   [ 150 / 6 ]  =   sqrt [ 25 ] =  5   = edge length

Volume =  [edge length ] ^3  =  = 5^3 =   125