68
The complex conjugate pair 2 ± 7.7460i where i is the imaginary square root of -1.
84
25
23
4 1
-6
-56
1
20
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,4
1, 4, 16, and 64 is a pattern. It multiplies by 4 each time. The next number would be 256.
-16
4 and 11.