Answer:
1. 340
2. 358
3. 384
Explanation:
for each question you need to sum the six faces .
for example, in question 1 you have
2 faces with a surface area of
s = b × h = 5 × 8 = 40
2 faces with a surface area of
s = b × h = 10 × 8 = 80
2 faces with a surface area of
s = b × h = 10 × 5 = 50
total surface:
(2×40)+(2×80)+(2×50)