Question: Use the exponential decay model, A = A 0 e kt , to solve Exercises 2831. Round answers to one decimal place. The half-life of

Use the exponential decay model, A = A0ekt, to solve Exercises 28–31. Round answers to one decimal place.

The half-life of lead is 22 years. How long will it take for a sample of this substance to decay to 80% of its original amount?

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