A person has a displacement vector 50 meters due west and another displacement vector 40 meters due North. What is their total displacement vector?
A. 
64 meters NW
B. 
54 meters NW
C. 
84 meters SW
D. 
90 meters NW
4.
A person has a displacement vector 10 meters due east and another displacement vector 25 meters due North. What is the angle of their total displacement vector?