Problem
Place time on the horizontal axis. Values should range from 1650 to 2020.
Place the number of people on the vertical axis. Values should range from 0 to 20 billion.
Analysis
a) It took 1,649 years for the world population to double, going from .25 billion people to .50 billion people. How long did it take for the population to double once again?
b) How long did it take for the population to double a second time? A third time?
c) Based on your graph, in what year will the population reach 8 billion?
d) Based on your graph, how many years will it take for the population of 2004 to double?