SOLUTION: please help 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

Question 1173136: please help
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-16t^2
Find all values of for which the ball's height is feet.
Round your answer(s) to the nearest hundredth.
Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
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please help
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-16t^2
Find all values of for which the ball's height is feet.
Round your answer(s) to the nearest hundredth.
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