Growth, Decay and Interest Review

A population of bacteria doubles every 3 hours. If the initial population is 200, what will be the population after 9 hours?

• 400

• 800

• 1600

• 1800

A car depreciates in value by 15% each year. If the initial value of the car is $20,000, what will be its value after 2 years?

• $14,450

• $15,300

• $17,000

• $18,000

Calculate the simple interest on a principal of $5000 at an interest rate of 5% annually for 3 years.

• $788.13

• $5788.13

• $1000

• $1250

Which of the following equations represents an exponential growth model?

A radioactive substance decays at a rate of 10% per year. If the initial amount is 500 grams, how much will remain after 3 years?

• 405 grams

• 450 grams

• 364.5 grams

• 350 grams

Calculate the simple interest on a principal of $2000 at an interest rate of 3% annually for 4 years.

• $251.02

• $200

• $2251.02

• $300

Which of the following equations represents an exponential decay model?