Answer:
6
Step-by-step explanation:
Answer:
1. D
2. A
Step-by-step explanation:
Q1. Kerry is simplifying 
By the definition of negative powers,

Hence,

So, the first step in simplifying the expression is

Q2. Given the expression

First, use the definition of negative powers:

Thus,

Answer:
B
Step-by-step explanation:

If you don't understand, you can ask.
7.71 feet is your answer.