Perfect and funny shirt for your math teacher about functions. They'll get a good laugh and will definitely wear this t-shirt.

• This top is a great gift idea for your math teacher, professor, instructor or tutor for any event, or occasion, including Christmas, Birthday, Anniversary, Hanukkah, Mother's Day, Veteran's Day, Easter, etc. 100% Cotton. Order up a size to ensure a proper fit after washing.
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• Lightweight, Classic fit, Double-needle sleeve and bottom hem

This top is a great gift idea for your math teacher, professor, instructor or tutor for any event, or occasion, including Christmas, Birthday, Anniversary, Hanukkah, Mother's Day, Veteran's Day, Easter, etc. 100% Cotton. Order up a size to ensure a proper fit after washing.MathShirt