49 is a square of 7 and 4 is a square of 2. To get 45 you need to subtract 7² and 2². Therefore, its the difference of squares.
Answer:
precipitation would be your answer!
I think that one number is 77 and the other is 86. 77 + 9 is 86. 86 +77 is 163.
Wait doesn’t it tell you how to solve it tho