How to get the equivalent fraction of 11/16

You have to multiply the numerator and denominator by the same whole number.
So 11x2 and 16*2. Thus making 22/32.
Keep in mind you can make the whole number any number as long as you multiply the same number with the numerator and the denominator.

(x) - (y) = (1 + 4i)

(3 + 6i) - (2 + 2i) = (1 + 4i)