My Cousin rules.

I have recently been tutoring my cousing in math. She's enrolled in a Catholic high school, taking Algebra 2.
Last Sunday, I was looking through her notes and realized that some of the first examples in her notes were wrong. And they all had the same error. So, I pointed them out to her, and she said that her teacher had never mentioned anythin about them, and that she had copied them strait from the board. So I said she might want to bring it up to the teacher, so that everyone else in class doesn't make the same error consistently.
She approches the teacher and something like, "I think this might be wrong. My tutor said that when you divide by a negative number, you have to switch the direction of the inequality." And the teacher maintained that she was right.
Instead of letting it die there, liek so many students would, she asked another teacher, who happened to be the chair of the math department at that specific high school. Of course, the chair realized the error, and informed the teacher.
This past tuesday, My cousin had a test. She got a 99%.