-13
13 the answer is 13 13. Sum means add!
It is: 7+(-6) = 1
−6 + −7 = −13
-7 + -6 = -13
7 + 6 = 13.
27.
79
-5 - 7 + 6 = -6
6 plus 7 plus 8 equals 6 plus 8 plus 7, what property is that?That is the associative property.
6.
-5 + -7 + 6 = -6
5
If you mean: 6*(7+8)*(6+7)+8 then it works out as 1178
3+6+5+7+(9-7)=23
58.
6 plus 6 plus 6 plus 6 plus 6 plus 6 plus 6=6 x 7 =427 x 6 = 426+6+6+6+6+6+6=6 x 7= 42
8 plus 7 is 15. 15 plus 6 is 21. :)
6 + (-7) + (-3) = -4