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10.  The formula for the volume of a cone is V = rh.  Find the rate of change of the      

      volume if dr/dt is 2 inches per minute and h = 3r when  r = 6 inches .

11.  A ball is tossed into the air from a bridge and its height y (in feet) above the ground, t    

      seconds after it is thrown is given by

                                            y =

      a ________ How high above the ground is the bridge

      b ________ What is the velocity of the ball after 1 second

      c. _______   What is the acceleration after 1 second.

      d. ________ Using the graph to estimate the maximum height of the ball

12.  

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