Maria scored 72, 97, and 82 on her first three math tests. she wants to have a mean score of 82 for the quarter. how many points does she need on her last test to earn an 82 for the quarter

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

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?

What would the rule be for the reflection of y=-3