Vector A points in the negative y direction and has a magnitude of 4 units. Vector B has three times the magnitude and points in the positive x direction. Find the direction and magnitude of the following vectors. (a) A + B
° (counterclockwise from the +x-axis) (b) A - B
° (counterclockwise from the +x-axis) (c) B - A
° (counterclockwise from the +x-axis)