What is the additive inverse of -15?

The additive inverse of a number is the number that, when added to that number, equals zero. In other words, it is the number that "undoes" the original number's effect.

For -15, the additive inverse is the number that, when added to -15, results in zero. In this case, the additive inverse of -15 is 15. When -15 and 15 are added together, the result is 0: -15 + 15 = 0.

Therefore, the additive inverse of -15 is 15.