Answer :
It's basically like subtracting .
15-4 = 11 . So 11 is your answer
15-4 = 11 . So 11 is your answer
-4+(15) = 11
Your answer is 11 , you take 15 &' subtract 4 so you get 11
Your answer is 11 , you take 15 &' subtract 4 so you get 11
