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Mathematics 8 Online
OpenStudy (anonymous):

A ball is thrown into the air with an upward velocity of 28 ft/s. Its height (h) in feet after t seconds is given by the formula h=-16t^2+28t+7. How long does it take the ball to reach its maximum height? What is the balls maximum height? Round to the nearest hundredth, if necessary. A. Reaches a maximum height of 7 feet after 1.75 seconds B. Reaches a maximum height of 43.75 feet after 0.88 seconds C. Reaches a maximum height of 17.5 feet after 0.88 seconds D. Reaches a maximum height of 19.25 feet after 0.88 seconds

OpenStudy (anonymous):

Really need help guys!

OpenStudy (anonymous):

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OpenStudy (anonymous):

what is the derivative of the formula?

OpenStudy (anonymous):

I don't know. Just walk me threw it.

OpenStudy (anonymous):

You don't know how to do derivatives?

OpenStudy (anonymous):

No aha. I never paid attention in school and got expelled so I have no clue. Just doing it one day at a time.

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