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Please include step by step solution, thank you! B. The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at

Please include step by step solution, thank you!

B. The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. How long will it take for 90% of the lead to decay

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