Misleading pictures in math textbooks always send 10,000 volts of electricity down my spine. Thanks to the right-hand rule, the cross product should be pointing down, not up. This comes from the 2007 edition of Glencoe’s “Advanced Mathematical Topics,” a high-school Precalculus book.
For what it’s worth, this is the same line of textbooks that, in a supplementary publication, said that the rational numbers are not countable.
Mean Green Math 