*  Reading Outline, Sec2.4 *
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* Vocabulary/Definitions *
 - Leibnitz's notation
 - The meaning of dy and dx
 - How units are useful in interpreting the meaning of a derivative




* Understand *
1. If A(t) gives the average grade, in percent, on students' quizzes as
a function of the day of the week, with t=0 being Monday, what is
the units of A'(2)?  What is the meaning of the statement A'(2) = -3?


2. For the same A(t), what are the units of A^{-1}(75)?  What is the
meaning of the statement A^{-1}(75) = 1?


3. What are the units of (A^{-1})'(75)?