Shriya measured four nails using a ruler then she showed the lengths on a plot which plot correctly shows the lengths of the nails

Ineed to learn how to solve this problem

The expression 6x2 gives the surface area of a cube, and the expression x3 gives the volume of a cube, where x is the length of one side of the cube. find the surface area and the volume of a cube with a side length of 6m

How can you decide witch operations to use to slice a two step equation