SOLUTION: benjamin threw a rock straight up from a cliff that was 24 ft above the water. If the height of the rock h, in feet, after t seconds is given by the equation h= -16t^2 +20t+24, how

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Question 1016531: benjamin threw a rock straight up from a cliff that was 24 ft above the water. If the height of the rock h, in feet, after t seconds is given by the equation h= -16t^2 +20t+24, how long will it take for the rock to hit the water
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
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benjamin threw a rock straight up from a cliff that was 24 ft above the water. If the height of the rock h, in feet, after t seconds is given by the equation h= -16t^2 +20t+24, how long will it take for the rock to hit the water
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Solve the quadratic equation for t

-16t%5E2+%2B20t%2B24 = 0.

and you will know how long will it take for the rock to hit the water.