This is another question I had too and didn't understand as well.

Question

Vector Addition: Use the head to tail method to determine the resultant vector of the following velocity vectors.

V1= 540m/s @66 degrees
V2= 12m/s @182 degrees
V3= 96m/s @312 degrees
V4= 332m/s @261 degrees

Answer 1

see other post.