Answer:
If it's asking for the SA of a cube, then it's 340 square units.
Step-by-step explanation:
The surface area of a cube can be found by using the formula 2ab+2ac+2bc. In this case, we can use 5 as a, 10 as b, and 8 as c. When you plug it in, you get (2x5x10)+(2x5x8)+(2x10x8), which, when solved, will result in 340.
(2x5x10)+(2x5x8)+(2x10x8)
(10x10)+(10x8)+(20x8)
100+80+160
340