What is the surface area of the cube below?
a. 486 units^2
b. 508 units^2
c. 729units^2
d. 405 units^2

486 units²

Given:

s = 9 units

Let us find out the surface area of a cube.

The formula of the surface area of a cube is ,

where s is the length of one of the sides.

Thus, the surface area of the cube is 486 sq. units.

Notes:

From the formula for surface area, we make it s as a subject.

... Equation-1

The formula of the volume of a cube is

Substitute Equation-1 into the volume formula.

Thus, we have connected formulas of surface area with the volume of the cube.

Keywords: what is the surface area of the cube, the length of the cube, volume, 9 units,  486 units², 508 units², 729 units², 405 units², the formula

i believe the answer is c.