Posted by **Jane** on Friday, May 10, 2013 at 11:58am.

A ball is kicked from ground level into the air. Its height, y, in feet after x seconds can be represented by the equation y=40x - 16x^2. What is the total elapsed time, in seconds, from the time the ball is kicked until it reaches ground level again?

I used the quadratic formula and got 2.5. Is this correct?

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