<PRE><B>Question 926648</B>
The population of a city is modeled with the function P(x)=45,000(1.035)^x of years since 2010.
 Use the rule of 70 to estimate the doubling time for the population of this city.
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2*45000 = 45000(1.035)^x
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2 = 1.035^x
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x*log(1.035) = log(2)
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x = 20.15 years
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Cheers,
Stan H.
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