The exponential equation describing the population at any time t with an initial population 20000 and doubling time 3 years is O P= 10000 - 2t/3 O P= 20000 - 23/t O P= 20000 · 2t/3 O P= 20000 - 2–t/3 O P= 20000 - 2–3/t

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