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The population per square mile of a city is given by: (, ) = 25^2 30^2 + 250 + 420 + 180, where x and

The population per square mile of a city is given by: (, ) = 25^2 30^2 + 250 + 420 + 180, where x and y are miles from the southwest corner of the city limits and P is the number of people per square mile. Using the D-Test, find the maximum population of density, and specify the values of x and y.

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