The worlds population is aging. The approximate world
Chapter , Problem 5.2.48(choose chapter or problem)
The worlds population is aging. The approximate world population age 80 or older4 is given in Table 5.1. (a) Find a formula for , the number of people in the world age 80 or older, in millions, as a function of time, , in years since 2005. Use the form = . What is the annual percent rate of increase? (b) Convert to the form = . What is the continuous percent increase per year? (c) Find the doubling time. Table 5.1 (year) 2005 2006 2007 2008 2009 (millions) 89.144 92.175 95.309 98.550 101.901
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