7
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1 plus negative 10 is equal to -9.
Positive 4
Not necessarily. 5 + (-6) = -1, a negative 5 + (-5) = 0 or 5 + (-4) = 1, a positive.
4 + (-5) = -1
a negative number plus a negative number is negative. here is a proof.(-x)+(-x)(-1)x+(-1)x-1(x+x)-1(2x)-2xa negative number times a negative number is positive though.