-57
+7 and -8
The 8 factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56. 2 and 8 add up to 10. Also, 1, 2, and 7 add up to 10.
7 and -8
53 and 3 are two prime numbers that add up to 56
56 + 56 + 28 + 8 + 2 + 1 = 151
-54 and -2 aren't technically factors of 108, but they will satisfy this problem.
-49 and -7 -42 and -14 -28 and -28
Factors are multiplied, not added. The question needs to be something like, "Which two factors of thirty add up to 11?" The answer would then be 5 and 6.
-56
109
-32
-7 and 8
119