2. What is the sum of two numbers that are additive inverses?

So in other words, the additive inverse of x is another number, y, as long as the sum of x + y equals zero. The additive inverse of x is equal and opposite in sign to it (so, y = - x or vice versa). For example, the additive inverse of the positive number 5 is - 5. That's because their sum, or 5 + (-5) = 0.

what are the choices