Suppose traffic volume on a particular road has been as follows:
Year Vehicles
1970 ...... 40,000
1980 ...... 60,000
1990 ...... 90,000
2000 ......135,000
a. Sketch a graph of traffic over time.
b. Find the discrete-time dynamical system that describes this traffic.
c. What was the traffic volume in 1960?
d. Give a formula for the predicted traffic in the year 2050.
e. Find the half-life or doubling-time of traffic.