1. Explain the concept of modeling.

How does a model describe known data and predict future data?
How do models break down (what can cause this)?
Can you think of an example?

2. Imagine that points on a line on a Cartesian graph represent approximately the distance y in feet a person walks in x hours.
What does the slope of this line represent?
How is this graph useful?
Provide another example for your colleagues to explain.

3. Can one line have two slopes?
Explain how or why not.