What is the displacement experienced as you move from, (-3M, 8M) to (7M, -12M)

21. What is the displacement experienced as you move from, (-3M, 8M) to (7M, -12M)?

A. (10M, -20M)

B. (-10M, 20M)

C ( 10M, 20M)

D ( -10M, -20M)

22. In problem 21, lets say that the displacement took you 4.7 seconds to complete, what is your velocity?

A. 4.76 m/s<<117 degrees

B. 4.76 m/m < 117 degrees

C. 4.76 m/s << 63.4 degrees

D. 4.76 m/s < 63.4 degrees

21.
[(7 - -3 ), (-12 - 8)]
(10M, -20M)
So A

22.
velocity = displacement / time
velocity = [√(10² + (-20²))] m / 4.7 s
velocity = 4.75759 m/s
angle = arctan(-20/10)
angle = 63.43º
So D? I'm not sure what the intended difference between "<" and "<<" is.