First we need to find the growth rate The exponential growth formula is P=A e^rt P population in 1997=42 million A population in 1992=39 million E constant R growth rate ? T time 5years (1997-1992) Solve the formula for R R= [log(p/A)÷log (e)]÷t R=(log(42÷39)÷log(e))÷5 R=0.015
Now estimate the population in 2009 using the same formula P=A e^rt P ? A 42 million R 0.015 T 12 years (2009-1997) E constant P=42×e^(0.015×12) P=50.28 million round your answer to get 50 million