You add/subtract complex numbers simply by adding/subtracting real parts and imaginary parts.
So, the real part of this sum is the sum of the real parts:

And the imaginary part of this sum is the sum of the imaginary parts:

So, you have

Answer:
The answer to the test is 1. B 2.C 3.B 4.A and this is one is C for the answer.
A = LW
Divide both sides by L (To isolate W)
W = 
Answer:
she would read 20 pages in 1 whole hour