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The doubling period

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The count in a bacteria culture was 900 after 20 minutes and 1300 after 35 minutes. What was the initial size of the culture?
Find the doubling period.
Find the population after 80 minutes. When will the population reach 13000.

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The doubling period is demonstrated in this solution.

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Assume the culture size at time t is n(t), then it can be expressed as

n(t) = n0 * 2^(t/r)

where n0 is the initial ...

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