Growth and Decay B

1. Classify the model as Exponential Growth or Decay. A = 1200(.85)^x

• Growth
• Decay

2. Is this graph exponential growth or decay?

• growth
• decay

3.. Pick the equation that is exponential growth

• y = 6(0.5)^x
• y = 0.9(2)^x

4. Pick the equation that is exponential decay

• y = 2000(0.88)^x
• y = 0.5(1.63)^x

5. What is the initial value, for the function: f(x) = 800(0.85)^x

6. Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

• y=15(35)^x
• y = 15(1.35)^x
• y = 15(.35)^x
• y = 35(1.15)^x

7. What is the decay rate in the following model? A= 1200(.85)^5

• -1200
• 85
• 15
• -6

8. Write an equation that models the situation. Samantha's hair was known to grow very rapidly. It began at a length of 6 inches and grew at a rate of 14% a week.

9. Solve the equation you wrote in #8 to determine how much her hair has grown in 5 weeks. Round to 2 decimals.

10. A population of fish starts at 8000 and decreases by 6% per year. What is the population of fish after 10 years?