This is not teaching. This is just copying the textbook to the blackboard and reciting the textbook text. A real teacher would give concrete examples which showed with integers how these functions worked.####[['NULL', 'Course_General_Feedback', 'NEG'], ['integers', 'Mathematical_Related_Concept', 'NEU'], ['functions', 'Mathematical_Related_Concept', 'NEU'], ['teacher', 'Instructor', 'NEU']]