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Use the exponential decay model, A = Age, to solve the following. The half-life of a certain substance is 27 years. How long will it

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Use the exponential decay model, A = Age", to solve the following. The half-life of a certain substance is 27 years. How long will it take for a sample of this substance to decay to 85% of its original amount? It will take approximately for the sample of the substance to decay to 85% of its original amount. (Round to one decimal place as needed.)

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