the answer is B your welcome
To subtract vectors, you simply have to subtract correspondent coordinates.
So, if you have

the subtraction is simply

So, in your case, we have

Grab a calculator, a ruler, a piece of paper, a pencil, and a big text book and get to work!
About eight pounds.
You divide 20 by 5, which is four. You then multiply 4 by the amount of pounds (2).
Hope that helps