The exponential equation describing the population at any time t with an initial population 90000 and doubling time 5 years is O P= 90000 · 2ª/5 %3D O P= 45000 · 2t/5 O P= 90000 - 25/t O P= 90000 · 2–5/t O P= 90000 · 2-t/5

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