Question

Can someone help on Question C?

Answer 1

It’s b and a, hope this helps have a nice day! ;)

Answer 2

It's - b + a

Because we're going down the arrow on b or the opposite direction of b. Then, up to C where its vector is a as it lies half way on AC with half of the line labelled a. So, the other half must be also a.

Hope this helps!