I assume you mean the additive inverse. The sum of any number and its additive inverse is zero. For example, 7 + (-7) = 0.
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The answer is simply 0!
The additive inverse of 18 is -18. The additive inverse of any number is the opposite of that number, such that the sum of the original number and the additive inverse is zero.
The additive inverse property states that if you add a number and it's opposite the sum is zero. copy-ed from "ashby" your welcome C:
Yes In fact, the sum of ANY 2 angles of a square (or a rectangle) is 180o
What exactly do you mean when you say "the opposite of a whole number" . . .