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The radioactive isotope 14C has a half-life of approximately 5715 years. A piece of ancient charcoal contains only 74% as much of the radioactive carbon

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The radioactive isotope 14C has a half-life of approximately 5715 years. A piece of ancient charcoal contains only 74% as much of the radioactive carbon as a piece of modern charcoal. How long ago was the tree burned to make the ancient charcoal? (Round your answer to the nearest integer.)

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