SORRY, i wrote this question wrong before ...

Question

u, v, w are UNIT VECTORS. the angle between u and v is 25 degrees and the angle between vector v and w is 35 degrees.
find (v+w-3v). NOTE: vector u and w are on opposite sides of vector v.

Answer 1

I think you have partially corrected your question.

what about the v+w-3v ?
Where does u come into the picture?
v+w-3v would simply be w - 2v