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5. A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount

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5. A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is y = yoe. In how many years will there be 90% of the isotope left

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