The Population Density X Miles from the Center of a Certain

Multiple Choice

The population density x miles from the center of a certain city is $D ( x ) = 9 e ^ { - 0.06 x }$ thousand people per square mile. What is the population density 7 miles from the center of this city? Round your answer to two decimal places.

A) 5.91 thousand people per square mile
B) 6.57 thousand people per square mile
C) 13.70 thousand people per square mile
D) 5.26 thousand people per square mile