If a population doubles in size every 5 years, then its geometric rate of increase is λ=  ? (provide an exact expression, i.e. no decimal approximation). Write down a model for the relationship between the current size of the population u, the original size of the population a, and the number of years since the original population was established t.   Answer: u= ?  (provide an exact expression, i.e. no decimal approximation).

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