Help?

I'm getting to spend this beautiful Saturday cooped up at my desk studying for a microeconomics test that will most certainly be the death of me. I vaguely remember the head of the economics department telling me (years ago) that if I plan to go on to graduate school in economics then I should use my undergraduate electives towards upper-level math classes. But what fun would that have been? Not nearly as much fun as taking classes like "backpacking & camping" and using the spare time to plan a wedding! The fun was short-lived. So if any of you math guru's out there have any insight on the following topics, it would sure save me some time on Wikipedia.com:

Quasi-concavity, homothetic functions, Euler's theorem, Marshallian demand vs. Hicksian demand, log-function rule, matrix determinants, second principal minors, bordered Hessian matrices, Lagrangian multipliers, monotonic transformations, Cobb-Douglas utility, the envelope theorem, or Shepherd's lemma.

Seriously, who comes up with this stuff?