Question

Please explain as well!

Answer 1

12 in.

Explanation:

Surface area of cube: 6a^2

Surface area= 864 inches

864= 6a^2

/6 /6

144= a^2

`√(144\\)`=
`√(a^2\\)`

a= 12 or -12

A side can't be a negative number, so the answer is 12 in.