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(A)This exercise uses the radioactive decay model. The burial cloth of an Egyptian mummy is estimated...

(A)This exercise uses the radioactive decay model.

The burial cloth of an Egyptian mummy is estimated to contain 58% of the carbon-14 it contained originally. How long ago was the mummy buried? (The half-life of carbon-14 is 5730 years. Round your answer to the nearest ten years.)
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(b)This exercise uses the radioactive decay model.

A wooden artifact from an ancient tomb contains 60% 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. Round your decay rate, r, to 6 decimal places. Then round your answer to the nearest whole number.)
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