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The population density of a city is given by P(x.y) = - 25x -30y + 400x + 420y + 170, where x and y are

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The population density of a city is given by P(x.y) = - 25x -30y + 400x + 420y + 170, where x and y are miles from the southwest comer of the city limits and P is the number of people per square mile. Find the maximum population density, and specify where it occurs, The maximum density is people per square mile at (x,y) =

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