-21-(-21)= would this be 0 or 42

The answer to that question is 0.

It's zero because negative numbers are the opposite of non-negative numbers. For example, you can rewrite ideas you are already familiar with using negative numbers: 1 - 1 = 1 + -1 = 0 -1 - 1 = -1 + -1 = -2 -1 - -1 = -1 + --1 = -1 + 1 = 0 Two negative signs on the same number make a positive.

thanks Tyler

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