Answer
Opposites or additive inverses are two numbers that have opposite signs but have the same absolute value. Their sum is equal to zero.
(refer to the step-by-step part below for an example)
Work Step by Step
Opposites or additive inverses are two numbers that have opposite signs but have the same absolute value. Their sum is equal to zero.
Example:
$-4$ and $4$ have opposite signs but have the same absolute value of 4.
Thus,
$-4 + 4 = 0$