1. Writing Exponential Equations From a Table http://www.youtube.com/watch?v=e qPqx5yrFsg

2. From 2 Points http://www.youtube.com/watch?v=KVEPO2gn 2R8 http://www.youtube.com/watch?v=KVEPO2gn 2R8

3. From a Word Problem http://www.youtube.com/watch?v=b8Bn2fpe U2o http://www.youtube.com/watch?v=b8Bn2fpe U2o

4. Practice Word Problems Suppose that you are observing the behavior of cell duplication in a lab. In one experiment, you start with one cell and the cell population is tripling every minute. Write an equation. xy

5. Practice Word Problems Suppose that you are observing the behavior of cell duplication in a lab. In one experiment, you started with 100,000 cell and observed that the cell population decreased by half every minute. Write an equation. xy

6. Depreciation: Matt bought a new car at a cost of $25,000. The car depreciates approximately 15% of its value each year. a.) What is the decay factor for the value of this car? a)The decay factor is 1 - 0.15 = 0.85. (Remember that the decay factor is 0 < b < 1.) b.) Write an equation to model the decay value of this car where y is the value of the car; x is the number of years since new purchase c.) What will the car be worth in 10 years? Answer: $4,921.86