Respuesta :

Hello!

To find the surface area of a cube you use the equation

[tex]6 a^{2} [/tex]

a is a side length

Put in the values we know

[tex]6* 9^{2} [/tex]

Square the 9

6 * 81 = 486

The answer is [tex]C)486 mm^{2} [/tex]
Your answer to this question is C