Question: A certain radioactive isotope has leaked into a small stream. One hundred days after the leak, 11% of the original amount of the substance remained.

A certain radioactive isotope has leaked into a
A certain radioactive isotope has leaked into a small stream. One hundred days after the leak, 11% of the original amount of the substance remained. Determine the half-life of this radioactive isotope. The half-life is about |days. (Do not round until the final answer. Then round to the nearest whole number as needed.)

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