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OpenStudy (anonymous):
A wooden artifact from an ancient tomb contains 30 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.) Your answer is ? years.
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OpenStudy (anonymous):
\[\frac{1}{2}^{\frac{t}{5730}} = \frac{3}{10}\] Solve for t.
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