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Mathematics 19 Online
OpenStudy (anonymous):

Population density measures the number of people per square mile inhabiting a given living area. The population density of a certain city decreases as you move away from the city center and can be approximated by the function 8600(3.5 - r) at a distance r miles from the city center. The radius of the city is 3.5 miles. Set up an integral that can be used to estimate the total population of the city.

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