Question

Simplify 9 − (−4).

−13
−5
5
13

Answer 1

- - = +   9-(-4)= 9+4 so minus minus becomes plus. and 13 is the answer.

Answer 2

When subtracting integers, you add by the opposite sign. Right now, you are subtracting 9 by -4. Change this to adding 9 + (+4). Of course, 9 + 4 = 13.

The answer is 13 or D.