Mathematics, 29.10.2020 02:40 JammedBanjo58

an observation deck extends 121 feet out about a valley. The deck sits 71 feet above the valley floor. If an object is dropped from the observation deck, its height h in feet, after t seconds, is given by h=-16t^2+71. How long will it take for the object to be 7 feet above the valley floor?

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