2. Suppose the gross population density function for an urban area is estimated to be: D(x) = 7500*e"(-0.1x), where g is the base of the natural logarithms and x is distance to downtown in miles, and D(x) is the population density in people per square mile. a. What is the value of the density gradient for this urban area? 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 1 10 1000 500