The population density in a large city is related to the distance from the center of the city. It can be modeled by the function below: 5000x x² +36 D = where D is the population density, in people per square mile, and is the distance from the center of the city. For what distances(s) from the city's center is the population density 400 people per square mile? O 4.5 miles O 8 miles O 4.5 miles and 8 miles O The population density never reaches 400 people per square mile.

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