25
18
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 . . .
The numbers that add to get 6 and multiply to get 81 are 3 and 3.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
-27
Yes
9, 18 and 36
-3 and -6
The numbers are: 9 + square root of 129 and 9 - square root of 129
29
-25
-52
-154
the answer is 18
-25
25