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O.3821t If the pollution of Lake Erie were stopped suddenly, it has been estimated that the level y of pollutants would decrease according to the

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O.3821t If the pollution of Lake Erie were stopped suddenly, it has been estimated that the level y of pollutants would decrease according to the formula y = yoe , where t is the time in years and yo is the pollutant level at which further pollution ceased. How many years would it take to clear 75% of the pollutants? (Round your answer to three decimal places.) r=:vr

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