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I need help.. this one question says explain why the measurement "12.5 * 10^-6 centimeters" is written in correctly in scientific notation.. is it because it is not necessary to have the centimeters in there?

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No, scientific notation is ALWAYS the first digit followed by the decimal point followed by x 10 to the some power.
So 12.5 x 10^-6, although a correct number probably, is 1.25 x 10^-5 in scientific notation.
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