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OpenStudy (anonymous):
The ball is thrown up words at 64 ft/s from the top of an 80 foot building The height of the ball at time t can be modeled by the equation h(t)=-16t^2+64t+80 what is the maximum height the ball reaches
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OpenStudy (perl):
you can use t = -b/(2a) to find the time when the ball is at maximum height
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