-95
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0.5*[-5 - i*sqrt(23)] and 0.5*[-5 + i*sqrt(23)]
that is
-2.5 - 2.39792*i and -2.5 + 2.39792*i
where i is the imaginary square root of -1.
The factor pairs of -90 are (90, -1) (45, -2) (30, -3) (18, -5) (15, -6) (10, -9) (9, -10) (6, -15) (5, -18) (3, -30) (2, -45) (1, -90)
None of them add up to -5.
16 and -5
71
When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.
1 x 143 11 x 13
The factors of 11 are: 1, 11 The factors of 77 are: 1, 7, 11, 77