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A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds,

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A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation. Using this equation, find the time that the rocket will hit the ground, to the nearest 100th of second. y = -16x² + 170x + 61

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