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The half life of a decaying substance is the amount of time it takes for the substance to reduced to half of its original

The half life of a decaying substance is the amount of time it takes for the substance to reduced to half of its original amount. If a substance has a hafife of 850 years, and there are 30 mg present now, how long will it take for the substance to be reduced to 10 mg? It will take j years (Round to nearest lanth)

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