1. Chapter 4 Section 4.6 Applications and Models of Exponential Growth and Decay

3. Example In 2003 a population of 40 rock pythons escape into a swamp. In 2008 a biologists estimates the population to be 140. a)Find if y is the population t years after 2003 express y as a function of t. b)What is the population in 2015? c)In what year will the population reach 2,000?

4. About 28 days

5. Radioactive Decay Certain substances decay (slowly go away) over time. The amount time it takes for half of the substance to decay is called the half-life of the substance.