The factor pairs of 1600 are (1600,1)(800,2)(400,4)(320,5)(200,8)(160,10)(100,16)(80,20)(64,25)(50,32)(40,40)
None of them add up to 60.
26
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
The numbers are -10 and -70
Urny ony
-8 and -8
15 and -3
-4 and -25
95
-141
-8 and -4
-3 and 6
-13