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# Evaluating Exponential Functions

Human populations can be modeled using an exponential growth function. Use the Library for research or other resources to find the following:

Current world population
Current U.S. population
Current growth rate of the world population
Current growth rate of the U.S. population

Starting in the current year, determine the following:

Based on current growth rates, how long will it take world population to reach exactly 7 billion? How long to reach exactly 10 billion?

Based on current growth rates, how long will it take for the U.S. population to reach exactly 300 million? How long for exactly 400 million?

#### Solution Preview

Use the following website http://www.geohive.com/default1.aspx, we find the following

current world population: 6,589,571,013
current U.S. population: 300,795,465
The above numbers is for May 13, 2007.
Use the following websites http://en.wikipedia.org/wiki/World_population#Rate_of_increase and http://geography.about.com/od/populationgeography/a/populationgrow.htm , we find the following
Current growth rate of the world population : 1.14% per year
Current growth rate of the U.S. population: 0.6% per year.

Starting in the current year, ...

#### Solution Summary

This solution consists of a detailed explanation of evaluating an exponential function. It is provided in an attached Word document, and uses sources and calculations to determine the answers.

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