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8. A recreational swimming lake is treated periodically to control harmful bacteria growth. Suppose that 75 days after a treatment, the concentration of bacteria per

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8. A recreational swimming lake is treated periodically to control harmful bacteria growth. Suppose that 75 days after a treatment, the concentration of bacteria per cubic centime ter is given by C(15) C(t) = 30132 240:: + 500, 0 g t g 8 How many days after a treatment will the concentration be minimal? What is the minimum concentration

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