Question

Evaluate 7 − (−1).

6

−6

8

−8

Answer 1

8

Explanation:

The minus sign outside parentheses changes the sign of what's inside parentheses when parentheses are eliminated:

7 -(-1) = 7 +1 = 8

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Alternate way to think about it

Subtraction is the same as addition of the opposite. The opposite of -1 is +1, so subtracting -1 is the same as adding +1.