100 likes | 114 Vues
Lesson 8. Section two. Complete the following questions. Use your notes from lesson 8 – exponential growth and decay. Continue to write your answers on the answer sheet from lesson 8 – section 1. GROWTH When the amount increases by the same percent for each time period
E N D
Lesson 8 Section two
Complete the following questions. Use your notes from lesson 8 – exponential growth and decay. Continue to write your answers on the answer sheet from lesson 8 – section 1.
GROWTH When the amount increases by the same percent for each time period A = I ( 1 + r ) t DECAY When the amount decreases by the same percent for each time period A = I ( 1 -r ) t Exponential Growth and Decay
QUESTIONS: 1. What are the formulas for exponential growth and decay?
Using the exponential formulas, what does 1 + r or 1 –r become for each problem below?: 2. A $10,000 investment decreased by 3% each year for 5 years. 3. A city population of 200,000 increases 4% each year for 10 years.
Complete the following questions below. Decide which formula to use: simple interest, compound interest, exponential growth or decay. 4.Jessica deposits $4,000 in a savings account that pays interest at 6.5% a year. How much will the investment accumulate to after 1 year? 5. $7,563 is invested at 6.2% compounded annually for 10 years. How much money will the investment yield after 10 years? Round to the nearest penny.
Find the yield, to the nearest penny, of each investment: 6. A principal of $20,000 is invested at 6% compounded annually for 4 years. 7. A principal of $40,000 is invested at 4.9% compounded annually for 5 years. 8. A principal of $35,000 is invested at 4.5% compounded annually for 4 years.
Solve. Round answers to the nearest whole number. 9. A business earned $200,000 in 1997. If it is predicted that the earnings will increase by 3% every year, predict the earnings at the end of 10 years. 10. A biologist discovers that a certain bacteria has a growth rate of 4% every hour. There are currently 15,000 bacteria. Predict the number at the end of 6 hours.