abigail92272 abigail92272

02-09-2017
Mathematics

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Benjamin threw a rock straight up from a cliff that was 40 feet above the water. If the height of the rock h, in feet, after t seconds is given by the equation h=-16t^2+12t+40, how long will it take for the rock to hit the water?

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ThomasTheDankEngine ThomasTheDankEngine

02-09-2017

It says college mathematics so I'm assuming you have a graphing calculator.

Plug the equation into your calculator and find the x value that's in the first quadrant

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