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## Homework Statement

Let y = s(t) represent the number of students who have contracted measles at time t (days). Give an interpretation for each condition:

e) s' = 0, s" > 0

## The Attempt at a Solution

This seems counterintuitive to me, to think that the second derivative is also not zero. In the context of the problem, what does this mean? So far I've said that no students are contracting measles anymore, but I don't know where s" fits in here.