Answer Happy

A ball is thrown from an initial height of 4 feet with an initial upward velocity of 34f/s. The ball's height h (in feet) after, seconds is given by the following. h=4+34t−16t2 Find all values of , for which the ball's height is 20 feet. Round your answer(s) to the nearest hundredth. (If there is more than one answer, use the "or" button.)
At the park there is a pool shaped like a circle. A ring-shaped path goes around the pool. Its inner radius is 11yd and its outer radius is 17yd. We are going to give a new layer of coating to the path. If one gallon of coating can cover 6y2, how many gallons of coating do we need? Note that coating comes only by the gallon, so the number of gallons must be a whole number. (Use the value 3.14 for π.)