Answer please

1. The population density of urban areas (in people per square mile) can be modelled by ax D(x)= x2 + b' Where a and b are constants related to the overall population and sprawl of the area under study, and D (x) is the population density (in hundreds), x mi from the center of downtown. Graph the function for a = 63 and b = 20 over the interval x e [0, 50] and then use the graph to answer the following questions. a. What is the significance of the horizontal asymptote (what doe mean in this context)? b. How far from downtown does the population density fall below 525 people per square mile? How far until the density falls below 300 people per square mile? c. Use the graph and table to determine how far from downtown the population density reaches a maximum. What is this maximum