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Zero, negative, and fractional exponents | Pre-Algebra | Khan Academy

Zero, Negative, and Fractional Exponents Practice this lesson yourself on KhanAcademy.org right now: ...

2010-04-08 14:04 569,229
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Introduction to matrices

What a matrix is. How to add and subtract them. Practice this yourself on Khan Academy right now: ...

2008-06-08 11:51 1,706,951
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Unit conversion within the metric system | Pre-Algebra | Khan Academy

Metric unit conversion Practice this yourself on Khan Academy right now: ...

2007-01-15 09:17 829,826
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Hertz Meaning

Video shows what hertz means. In the International System of Units, the derived unit of frequency; one (period or cycle of any periodic event) per second.

2015-04-13 00:33 5,259
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