Yes, Houghton Mifflin's "Saxon" math textbook promoters spelled "derives"..."derrives." That's three typos/errors==> http://www.hmheducation.com/saxonmath/common-core.php …
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@michellemalkin that's what my son is using. Saxon has a new geometry. Wonder if its good or not?#commoncoreThanks. Twitter will use this to make your timeline better. UndoUndo
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