I think there's a typo. As written it is just
20 e^-t
Anyway, since I have no idea when the plague began, I have no value for t.
As for B, the typo does not allow for a limiting population.
The logistic growth function f(t)= 100,000/5000e^-t describes the number of people, f(t), who have become ill with influenza t weeks after its initial outbreak in a particular community.
A) How many people became ill with the flu after the epidemic began?
B) What is the limiting size of the population that becomes ill?
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