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83. The graph above gives the velocity, ,v in ft/sec, of a car for 08,££twhere tis the time in seconds. Of the following, which is the best estimate of the distance traveled by the car from 0=tuntil the car comes to a complete stop?
84. For 1.51.5,-<<xlet fbe a function with first derivative given by ( )(2.-+=-¢xxfxeWhich of the following are all intervals on which the graph of fis concave down? )4