The 63 is the err in her explanation here.
Simplifying it would make it 3/4b^2. I can't write it down the correct way, but it's three over four times b squared. Unless it's a square root, then things would be different.
Answer:
$25.50
Step-by-step explanation:
35 - 9.5 = x
25.5 = x
Answer:

Step-by-step explanation:
and 

Answer:
1/10 or 0.1 or 10%
Step-by-step explanation: