Answer:
16
Step-by-step explanation:
6+2(t) --> 6+2(5) --> 6+10=16
(-2+1^2)+5(12/3)-9
(1)+5(4)-9
1+20-9
21-9
12
What's the difference between A) and C)??
There should be an E) because the correct answer would be in either of these forms:

Therefore, a is 7 aka real part and b is 19 which is imaginary part.
If I’m correct negative one half