18
The two numbers are -1 and -2
8 & 16
91 and 2
multiplied to seventy and add to nine is impossible, but add up to 9 and multiplied to -70, or add up to -9 and multiplied to 70 are possible. In that case, 14 and -5 would do it (or -14 and 5)
27
726
18
-17
The two numbers are -1 and -2
-7
Two consecutive two digit numbers that when multiplied give the product of 812 are 28 and 29.
8
-5 and -7
59
16 and 15
575