Answer:
54 sq in.
Explanation:
For a cube, try using the rectangular prism formula. (there's an easier way but I prefer this one)
2lw + 2hw + 2lh
(2 × 3 × 3) + (2 × 3 × 3) + (2 × 3 × 3)
18 + 18 + 18 + 18
SA = 54 sq in
hope i explained it (you can search up the formula for a cube but i like this one)