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31
-13
-10 and 2 -12 and 4 -20 and 12
-20 and 2
The factors of 8 are 1, 2, 4, and 8. The factors that add up to 10 are 2 and 8.
factors of 30 that add to 17 are 2 and 15
-1005
167
171
The factors of -504 are 2, 2, 2, 3, 3, 7 and -1. Then the factors that add to -3 are -24 and 21.
Factors of 250 that add up to 8 = 1 + 2 + 5
23