Answer:

Step-by-step explanation:
The formula of a surface area of a cube:

The formula of a volume of a cube:

We have

Calculate the edge length (<em>a</em>).
<em>divide both sides by 6</em>

Calculate the volume of a cube:

900 because 9 is greater than 5 so it rounds to my answer.
A problem with extra information will be difficult to solve because you may not be able to tell what information you might need to use for the problem.
4x is the proportionality