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The Number of Grams of a Radioactive Substance in Charcoal

Question 24

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The number of grams of a radioactive substance in charcoal from an ancient campfire after t years is given by The number of grams of a radioactive substance in charcoal from an ancient campfire after t years is given by . If the sample has only 14 grams of radioactive substance, then when was the campfire used? .
If the sample has only 14 grams of radioactive substance, then when was the campfire used?

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