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A ball is thrown directly upward from a height of 4 ft with an initial velocity of 24 ?ft/sec

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A ball is thrown directly upward from a height of 4 ft with an initial velocity of 24 ?ft/sec. The function ?s(t) =  -16t^2 + 24t + 4 gives the height of the? ball, in? feet, t seconds after it has been thrown. Determine the time at which the ball reaches its maximum height and find the maximum height.