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# Scientific notation

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A human being has about 2.5 X 10(to the 13th power) red blood cells in her bloodstream. There are about 2 white blood cells for every 1,000 red blood cells. How many white blood cells are in a human's bloodstream?

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This uses ratios and scientific notation to solve a word problem. How many white blood cells are in a human's blood are discussed.

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Since there are about 2 white blood cells for every 1,000 (or 10 to the 3th power) red blood ...

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