-1+-1=0
I'm just improving but actually a negative plus a negative is a negative, therefore -1+(-1)=-2
and you cant have to signs touching so the second negative one should be in parenthesis. and i believe the answer to your question is an opposite.
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Additive inverses
It would be possible to find two numbers whose sum is 7, two others whose difference is 7,two others whose product is 7, and two others whose quotient is 7.But if you're looking for numbers that equal 7, then 7 is your only choice.
It's quite possible to find two numbers whose sum is 308, two others whose differenceis 308, two more whose product is 308, and another two whose quotient is 308.But if you're looking for numbers that equal 308, then your only choice is 308 .
Absolute value
Three. Equal forces, two.