A ball is thrown from an initial height of 5 feet with an initial upward velocity of 21 ft/s. The ball's height h (in feet) after t seconds is given by the following. h= 5+21t-161 Find all values of t for which the ball's height is 11 feet. Round your answer(s) to the nearest hundredth. (If there is more than one answer, use the "or" button.) t = -||seconds O or O ? initial height ground

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