In 2012, there were 314 million people living in the United States.
a. If the U.S. population grows at a constant rate of 3% per year, what will the population be in 2022?
b. If the population grows at a constant rate of 3% per year, what would the population have been in 2006?
c. Suppose that the U.S. population has been growing at 3% per year, but at the beginning of 2015, the growth rate falls to 1.5% per year and remains there until 2022. What will the population be in 2022?
d. At what rate would the population need to grow between 2012 and 2022 in order for there to be 400 million people living in the United States at the beginning of 2022?