Worksheet 11-5
Exponential Growth and Decay

Solve each problem involving exponential growth or decay.

1. A population of 500 bacteria grows at a rate of 12% per hour. Write an equation to represent the population P after t hours.
2. Find the population of bacteria after 5 hours.
3. An investment of $1,000 earns 6% annual compound interest. Calculate the account balance after 10 years.
4. A car depreciates in value by 15% each year. If the purchase price was $20,000, find its value after 4 years.