Mathematics, 11.03.2021 19:00 luv4appleallday

An observation deck extends 118 feet out above a valley. The deck sits 68 feet above the valley floor. If an object is dropped from the observation deck, its height in feet, after t seconds, is given by h= -16t^2+ 68. How long will it take for the object to be 4 feet above the valley floor?

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