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If 21 grams of radioactive waste reduces to 8.75 grams of radioactive waste after 1400 years, then what is the half-life for this radioactive element

If 21 grams of radioactive waste reduces to 8.75 grams of radioactive waste after 1400 years, then what is the half-life for this radioactive element (i.e., how long will it take for 10 grams to reduce to 5 grams)? An exponential model is = ^ .

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