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A model for the number of people N in a college community who have heard a...

A model for the number of people N in a college community who have heard a rumor is given by the equation: N=P(1-e^-.15d) where P is the total population of the community and d is the number of days elapsed since the rumor began. If the number of students is 1,000 find the number of days when 450 students would have heard the rumor?

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