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posted by john on Sunday, May 1, 2011 at 11:57pm.

3.5 X 10 ________ 7 x 10^-9

3.5 *10 ________ 7 *10^-9 1*10^9*10 _________ 2 1*10^10 _______ 2 0.5*10^10=0.5*10,000,000,000=5,000,000,000

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