Question

I’ve been stuck on this for days I just need a simple answer

Answer 1

280 in²

Explanation:

The opposite faces are congruent , then surface area (SA ) is

SA = top/ base + front/ back + 2 sides

note for the front/ back and 2 sides we have 3 + 3 + 3 = 9 in

SA = 2(8 × 4) + 2(8 × 9) + 2(4 × 9)

= 2 × 32 + 2 × 72 + 2 × 36

= 64 + 144 + 72

= 280 in²

Answer 2

408

Explanation:

Surface area formula is A=2(wl+hl+hw)

Substituting these values into the formula you would get

2·(3·8+4·8+4·3)=136

136 accounts for one rectangular prism.

Since you have 3 multiply 136 by 3 which would leave you with 408