Question: Use the exponential decay model A=A0 e^kt to solve. The half life of a certain substance is 19 years. How long will it take for

Use the exponential decay model A=A0 e^kt to solve. The half life of a certain substance is 19 years. How long will it take for a sample of the substance to decay to 66% of the original amount. How many years will it take

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