A radioactive element decays according to the function Q= Q, e", where Qo is the amount of the substance at time t= 0, r is the continuous compound rate of decay, t is the time in years, and Q is the amount of the substance at time t. If the continuous compound rate of the element per year is r= - 0.000155, how long will it take a certain amount of this element to decay to half the original amount? (The period is the half-life of the substance.) ..... The half-life of the element is approximately years. (Do not round until the final answer. Then round to the nearest year as needed.). pei

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