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posted by Tina on Friday, January 29, 2010 at 8:11am.
using scientific notation 4x10^9/2x10^-7
4x10^9/2x10^-7 divide top and bottom by 2 to give 2x10^9/1x10^-7 then subtract the powers of ten as it is a division 9--7=16 so the answer is 2 x 10^16
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