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A radioactive element decays according to the function

`Q=Q_(0)e^(-t)`

, where

`Q_(0)`

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=-0.000217`

, 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.).