Question

what must be added to :
1) -72 to get 45? 2) -37 to get - 19?

Answer 1

45+72=117
-19+37=18
here is your answer

Answer 2

1) -72 + x = 45
=>x = 45 +72
=>x = 117

2) -37 + x = -19
=> x = -19 + 37
=> x = 18