Answer:
Step-by-step explanation:
1. (3b)^5
= (3b)^2 * (3b)^3.
2. Width = area / length
= 10^4 / 10^3
= 10^(4-3)
= 10 m.
$7.27
3.18 + 1.25 + 2.84 = 7.27