The Additive Inverse of a number is the opposite of the number.
A number and its opposite add up to give zero.
They are called additive inverses of each other.
The additive inverse of 7 is - 7.
7 + (- 7) = 0
The additive inverse of - 2 is 2.
- 2 + 2 = 0
A. - 13
B. - 5
C. - 8
D. - 3
Correct Answer: A
Step 1: The sum of 5 and 8 is 13.
Step 2: The additive inverse of 13 is - 13.