They are opposites or additive inverses. They equal zero when added together.
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okay well the answer to that is 91 got it (PS. you should know it!) :) peace!
58.
The answer is 380, I hope. :P
7+7+7+7+7+7+7+7 is the same as 7 multiplied by 8, so the answer is 56.
7 Times 7 Equals7 plus 7 plus7 plus7 plus7 plus7 plus 7, or 7 times 7, equals 49.