Calculus II for Bio

Ask a math question of medium difficulty. Try looking through some and see if you can work out the answers. You'll need a writing utensil and some paper. Don't be lazy.

Here are two problems to get things started:
(Without looking in your book) Give an example of two $2\times 2$ matrices which do not commute.

If there was a $2\times 2$ matrix $A$ such that $A \cdot B = B \cdot A $ for all $2\times 2$ matrices $B$, what does $A$ look like?

Section 3 Comments 20130919

This section has a relaxed atmosphere which is conducive to learning.
This section is cool.
: Great! I definitely want students to come to a conducive-learning environment.

I don't like the quizzes. The homework is going to give me gray hairs at age 18. Tim/John*, you're a cool TA though.
*Inside joke
The section is helpful, but I don't like the quizzes. We should do more exercises.
Do the quizzes count as a grade?
: I don't like the quizzes either, but you probably need them.
: Yes, the quizzes are factored into your grade.

The differentials involving population are quite difficult.
: We'll have to talk about that some time.

I hate trigonometry.
: There's a saying: "Keep your friends close, and your enemies closer." You'll need trigonometry to answer calculus questions. So while you don't have to like it, you have to use it.