A complex number has a real and an imaginary part
is a complex number
A complex number is represented as:
Where:
<em />
<em> real</em>
<em />
<em> imaginary</em>
<em />
By comparing the options to ;
and 
are not complex numbers
This is so because they do not have imaginary parts
However,
is a complex number
Because; 9i is imaginary
Read more about complex numbers at:
brainly.com/question/19007885
Answer:
The first one
Step-by-step explanation:
The first one because the largest exponent is odd and its coefficent is positive
-4 - (-36) = -4 + 36 = 32 units
I rounded it and the answer is 400
