The population density x miles from the center of a certain city is $D ( x ) = 10 e ^ { - 0.04 x }$ thousand people per square mile. What is the population density 9 miles from the center of this city? Round your answer to two decimal places.

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The Answer of The population density x miles from the center of a certain city is $D ( x ) = 10 e ^ { - 0.04 x }$ thousand people per square mile. What is the population density 9 miles from the center of this city? Round your answer to two decimal places.

The Population Density X Miles from the Center of a Certain