0. By the definition of "additive inverse", the sum of ANY number and its additive inverse must be 0.
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The additive inverse of 41 is -41. An additive inverse is the number that will make the sum equal zero.
It is zero, by definition of additive inverse!
Zero.
The additive inverse is the sum of two numbers that will equal zero. The additive inverse of -18 is 18.
If by "opposite" you mean "additive inverse", the sum is zero. For example, 5 + (-5) = 0.