49
81 - 50 = 31 50 - 19 = 31
31
31.
It is 31.
-31 (5*(-7))-(-4) (-35)+4 -31
9 subtracted from 40 = -31
15.5 x 2 = 31
6
16 31-15=16 15-31=-16
it is a prime number
range is always the greatest number subtracted by the least greatest number, in this example, you would subtract 10 from 31.31-10=21