A ball is thrown from an initial height of 2 feet with an initial upward velocity of 30 ft/s. The ball's height h (in feet) after t seconds is given by the following. h=2+30t-16t^2
Find all values of t for which the ball's height is 15 feet.
Round your answer(s) to the nearest hundredth.
(If there is more than one answer, use the "or" button.)