176
The two numbers are the complex conjugates: 4 - 12.3288iand 4 + 12.3288i where i is the imaginary square root of -1.
6568
-190
199
109
155
45
-144
The numbers are: 20 and -48
-9.22043 and 18.22043 (to 5 dp).
736
-82
you could multiply 84 by 10 = 840 then multiply 84 by 2 = 168 add these two numbers = 1008