The deck of a bridge is suspended 285 feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of the pebble above the water surface after t seconds is given by y = 285 – 16t2. (a) Find the average velocity (in ft/s) of the pebble for the time period beginning whent = 4 and lasting the following amount of time.

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