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A wooden artifact from an ancient tomb contains 70% of the carbon14 that is present in living trees. How long ago was the artifact made? (The halflife of carbon14 is 5730 years. Round your answer to the nearest whole number.)

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A wooden artifact from an ancient tomb contains 55% of the carbon14 that is present in living trees. How long ago was the artifact made? (The halflife of carbon14 is 5730 years. Round your answer to the nearest whole number.)

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The halflife of carbon14, which is used in dating archaeological finds, is 5730 yr. Assume that 100% of the carbon14 is present at time 0 yr, or x=0. Write the equation that expresses the percentage of carbon14 remaining as a

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what would be the chart to use for carbon 14 whcih has a half life of 5730 years and a piece of wood which originally has 12 grams pf radioactive isotope; If the half lives occurred and now has 0.75 grams left?
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