Use three significant figures in calculation, provided the data are accurate enough. Learn the meaning of these common symbols for numbers. Avoid M, which is ambiguous. The purpose of this class is learning in a pleasant, intellectual environment. Students should feel comfortable thinking about the subject matter and asking questions.
Some questions are to clarify statements made by the instructor.
Other questions are to explore difficulties encountered in doing homework. Of course, the student is expected to come to class and afterward make an effort afterward to understand the material. But certain questions of clarification are best asked as soon as they occur to the student. Other questions are best asked outside class. To facilitate class discussion, you are encouraged to speak up without raising your hand.