SOLUTION: The Wikipedia (http://en.wikipedia.org/wiki/World_population) reports that the world population is 6.8 and is projected to be 9 billion by 2040. If these figures are correct, what

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Question 511020: The Wikipedia (http://en.wikipedia.org/wiki/World_population) reports that the world population is 6.8 and is projected to be 9 billion by 2040. If these figures are correct, what is the yearly population growth rate? If this growth rate were historically correct, what is the predicted population for the year 1 AD?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
A 2.2 billion gain in 29 years would average out to 758 million people per year.

If population growth was linear, the population in 1 AD would have been (6.8*10^9) - 2010(7.58*10^7), roughly -140 billion. Does that make sense?

This is why most linear regressions do not work for predicting extremely small or extremely large x-values.