Calculating TRUE headings...
First off, hopefully i've posted this in the right forum. If not - apologies.
Secondly - i'm currently going over some notes and am trying to brush up on my knowledge. Im currently stuck on what is a seemingly easy question 
Given compass heading 030, deviation 3W and variation 8E, what is the true heading?
a. 030°
b. 025°
c. 019°
d. 035°
I dont want anyone to just give me the answer - i want to understand it, and hopefully it'll stick in my head this time! I seem to remember the whole "West is best (i.e add the figure on) - East is least (subtract)" part of the groundschool, but would be grateful if someone could explain it better here - or point me in the way of some theory so i can read up.
Many thanks.