A negative number.
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-n+-n=-2n so -1+-1=-2. In simple terms a negative plus a negative eqauls a negative. You can just add the numbers as if they are positive and then add a negative sign to the answer.
positive plus positive equals positive negative plus negative equals negative
negative plus positive equals to zero
Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.
a positive plus a negative is a positive example 9-(-2) you would change the double negative to a positive hope this helped :)