391
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.
-32
7
The factors of -35 are 1, -1, 5, -5, 7, -7, 35, -35 No two of them add up to -13.
119
-3 and 16.
-90 and 3
6 and -1
0
The factors of -9 are 1, -1, 3, -3, 9, -9. No two of those add up to 7.
Factors multiply, like 1 x 11. Addends add, like 5 and 6.