Scientific notation... help. Answers in picture

Answer:
0.5meters
Step-by-step explanation:
A single sheet is 1 * 10^-4
Ten reams is 5 * 10^3 pieces of paper,
The whole stack is (1 * 10^ -4) * (5 * 10^3)
= 1 * 5 * 10^ (-4+3)
= 5 * 10^ -1
= 0.5meters