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A tourist in a sightseeing balloon drops his cell phone from a height of 820 feet above the ground. Find the time t (in seconds)

A tourist in a sightseeing balloon drops his cell phone from a height of 820 feet above the ground. Find the time t (in seconds) for the object to reach the ground. The height (above ground) of the object is modeled by

Height= -16t²-10t+820.

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