The additive inverse is the sum of two numbers that will equal zero. The additive inverse of -18 is 18.
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negative
It is a positive number. Specifically it is 18.
A number and its additive inverse add up to zero. If a number has no sign, add a "-" in front of it to get its additive inverse. The additive inverse of 5 is -5. The additive inverse of x is -x. If a number has a minus sign, take it away to get its additive inverse. The additive inverse of -10 is 10. The additive inverse of -y is y.
-45
The additive inverse of 41 is -41. An additive inverse is the number that will make the sum equal zero.