Although negative numbers aren't usually considered factors, you can use -21, -3 and -2.
The factors of 21 that add up to 8 are 1 and 7.
I suppose you could use -42 twice. -63 and -21
factors of 30 that add to 17 are 2 and 15
15 and 4 are the factors of 120 that add up to 19.
-21 and -1
31
Multiples don't add. Addends add, like 13 + 14 + 15 = 42 but I suspect you want factors, specifically prime factors. 2 x 3 x 7 = 42
They are: 21+6+2 = 29
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.
Factors multiply, like 1 x 11. Addends add, like 5 and 6.
no 11 is not a perfect number because when u add the factors the don't add up to 11
126 and -63 42 and 21 54 and 9
-589
-49 and -7 -42 and -14 -28 and -28
-31
29, 11, 2