archimedes848 archimedes848

07-03-2017
Mathematics

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a rock is thrown straight up into the air from a height of 4 feet. the height of the rock above the ground, in feet, t seconds after it is thrown is given by -16t^2+56t+4. for how many seconds will the height of the rock be at least 28 feet above the ground?

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07-03-2017

18 is the answe skikiii

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