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Mathematics - Linear Operators

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Based on exponential growth function how long will it take the world population to reach exactly 7 billion? How about 10 billion?

Based on the population how long before it will reach 400 million? and 500 million?

I need to give an explanation in within one page.

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(1) 6713,485,555 [http://www.census.gov/main/www/popclock.html]

(2) 304,735,352 [http://www.census.gov/main/www/popclock.html]

(3) 1.14% [http://geography.about.com/od/populationgeography/a/populationgrow.htm]

(4) 0.894% ...

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