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OpenStudy (anonymous):
The number of people in a school with a population of "P" that have heard a rumor, "t" hours after the rumor began, is expressed by N=P(1-e^-rt). The rate at which the rumor is spread is "r". If there are 750 students at the school and two hours after the rumor began 250 have heard the rumor, then.... a) Find "r". b) How long until 600 students have heard the rumor?
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