How can I solve this exercise?
From system of equations.

47 - 90 = 43

43 - 180 = x

x = 137

24

step-by-step explanation:

you just have to add the 15 + 9 to get 24

you do this bc you want to find the total of the whole line and those two numbers make up the line

it could be 242. irdk i tried my best

it would be r^2 - 2rs +s^2

assuming   you mean to square it