What is pre-algebra? If you want to be a smart-aleck, I guess that any form of arithmetic before algebra could be considered "pre-algebra." But Khan Academ

Example: two-step equation with numerator x | Linear equations | Algebra I | Khan Academ - YouTube

Back in June we told you that we’d be experimenting with a learning lab, and today marks the opening of the Khan Lab School, which will be composed of a small cohort of around 30 students. Khan Academ

Bruegel, Hunters in the Snow (Winter) | Antwerp, Bruges and Brussels | Northern Renaissance: 1500s | Renaissance & Reformation in Europe | Khan Academy

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This is a video about Diego Velazquezes most famous artwork, Las Meninas. The people in this video look at and analyze why Velazquez painted different aspects of this painting. I think it tells you alot about velazquez as a painter and Las Meninas

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Smarthistory.khanacademy.org is a free and open, not-for-profit, art history textbook. Part of the Khan Academy, we use multimedia to deliver unscripted conversations between art historians about the history of art.

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