A tennis ball is thrown into the air from the top of a hotel that is 350

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A tennis ball is thrown into the air from the top of a hotel that is 350 feet above the ground. The height of the ball from the ground is given by
D(t) = - 16t2 + 10t + 350 feet
where t is the time, in seconds, after the ball is thrown. How long after the ball is thrown does it hit the ground?
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