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A certain radioactive element decays according to the formula N(t)=N_(0)2^(-(t)/(20)) where N_(0) the amount of substance is and t is in years. How much

A certain radioactive element decays according to the formula N(t)=N_(0)2^(-(t)/(20)) where N_(0) the amount of substance is and t is in years. How much of the original substance of 1000g will remain after 300 years?

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