Real-World Problems - Notes from Feb 5, Feb 6, Feb 9

We're looking at three different kinds of real world problems in class.
* Half-Life:  caffeine, medicine, etc., or carbon dating
* Cooling: hot water or coffee, or time of death (solving a murder!)
* Interest: investing money

These are the notes from today and Monday (2B and 3B) and tomorrow (1A). Note to 1A - we will likely skip the "cooling" problem, because we have less time before the test than 2B and 3B.

HALF-LIFE: (all classes)

COOLING: (2B and 3B only, and this is NOT on the test)

INTEREST: (all classes)