91
9 and 10 have to be the numbers, but 9 would have to be minus to give +1 (therefore causing the 90 to be -90). i.e. there are no two numbers that can satisfy this question due to their signs
It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.
-117
111
-9 and 10
71
113
-100
18 and -5
133
-117
111
-95