How do you reflect something on a coordinate plane?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Which two undefined geometric terms always describe figures with no beginning or end?

Rewrite so the subject can be y in the formula d=m-y/y+n