Question 135749
This is all one problem. I'm having trouble with this: In 1997, the population of the United States was about 266 million and the exponential growth rate 0.9% per year. 
a) find the exponential growth function
pop=266(1.09)^x million where x is the number of years after 1997)
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b) what will the population be in 2002?
P(5)=266(1.09)^5 = 409.27 million
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d) when will the population be doubled?
2*266=266(1.09)^x
2 = 1.09^x
x= log2/log1.09
x = 8.04 years
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Year = 1997+8.04 = 2005.04
So, the answer is either 2005 or 2006 depending on what you do with 
that 0.04 years.
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Cheers,
Stan H.