2. Suppose the gross population density function for an urban area is estimated to be: D(x) = ?500*eA(-0.2x), where e is the base of the natural logarithms and X is distance to downtown in miles, and [)(X) is the population density in people per square mile. a. What is the value of the density gradient for this urban area? Density Gradient = -0.2 96 change in density per square mile E mile Be sure to specify the units in which the gradient is measured. b. Fill in the blanks in the following table: Distance Gross Density 0 _75 00 1 _6140.5_ 10 _1015_ 3.14 4000 :80) 1514