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by Jim@StratusPrep » Wed Mar 14, 2012 7:25 am
9*10^9 is very close to 10^1 * 10^9, which equals 10^10. 3*10^4 is virtually insignificant to 10^10 (it is a million times smaller - this is like subracting 1 from a million).

Your answer is E.
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