An ant, crazed by the Sun on a hot Texas afternoon, darts over an xy plane scratched in the dirt. The x and y components of four consecutive darts are the following, all in centimeters: (30.0, 40.0), (bx –70.0), (–20.0, cy), (–80.0, –70.0).Th" overall displacement of the four darts has the xy components (–140, –20.0). What are?

(a) b, and

(b) cy? What are the

(c) Magnitude and

(d) Angle (relative to the positive direction of the x axis) of the overall displacement?