The proportion of carbon-14 still present in a sample after t years is  e−0.00012t.†Estimate the age of cave paintings if the carbon with which they were drawn contains only 3.9% of its original carbon-14. (Round your answer to the nearest year.)

Chemistry: Principles and Practice
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter21: Nuclear Chemistry
Section: Chapter Questions
Problem 21.42QE
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The proportion of carbon-14 still present in a sample after t years is 

e−0.00012t.†

Estimate the age of cave paintings if the carbon with which they were drawn contains only 3.9% of its original carbon-14. (Round your answer to the nearest year.)
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