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Dr. Xavier is the German Accented eighth-grade math teacher of James K. Polk Middle School. She first appeared in Guide to: Notebooks and Math and was rough on Cookie at first, but he eventually made her think that her way of teaching is old-fashioned and that we can learn and enjoy math and had a Super-Fun-Math Dance Party! She appeared in seasons 2 and 3. She was played by Lusia Strus

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