GO 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). The overall displacement of the four darts has the xy components (−140, −20.0). What are (a) bx and (b) cy? What are the (c) magnitude and (d) angle (relative to the positive direction of the x axis) of the overall displacement?
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