TUSK is an acronym for Things (Dr. Anglin Says) U Should Know. Like your times tables, there are certain axioms or lemmas that every good mathematics student should know such as, “You Can’t Divide by Zero”, “The Slope of a Vertical Line is Undefined”, as well as good old “PEMDAS”, The order of operations. So each nine-week you will learn a new TUSK Mathematical fact to build your mathematical repertoire.