If the length of one side of a cube is 4m.find it's volume

Answer 1

as the name indicates, the volume of a cube of side x is

v = x^3

so use your value for x. Don't forget the units.

Answer 2

I am not getting my solution

Answer 3

so, whose solution are you getting? Just use the formula!

v = (4m)^3 = 4m * 4m * 4m = 64m^3

better read up some more on volumes.