The complex conjugate pair
3.5 - 15.387i
and
3.5 + 15.387i
where i is the imaginary square root of -1.
There are none. The only factors of 249 are 1, 3, 83, 249.
249
-22
The numbers are: -5 and 3
199
-5 and +3
That depends whether you want to add the numbers, to multiply them, or what.
221
5 and -3
-5 and 3
Multiply the number by 100 and add a percentage sign.
-1