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You have 550-grams of an an unknown radioactive substance that has been determined to decay according to D(t)=550e-0.006359-t where t is in years. How

You have 550-grams of an an unknown radioactive substance that has been determined to decay according to D(t)=550e-0.006359-t where t is in years. How long before half of the initial amount has decayed? It will take years for half of the initial amount to decay. (Round to 1 decimal place)

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