Unit 5 – Exponential Functions
Name ________________________
Exponential Growth & Decay Practice
1) A population of 2500 triples in size every year. What will the population be in 30 years?
2) A culture of bacteria doubles every 2 hours. If there are 500 bacteria at the beginning, how many
bacteria will there be after 1 day?
3) A dish has 212 bacteria in it. The population of bacteria will grow by 80% every day.
How many bacteria will be present in 4 days?
4) Suppose a Zombie virus has infected 40 people at our school. The number of zombies doubles
every hour. Write an equation that models this. How many zombies are there after 3 hours?
5) Suppose a Zombie virus has infected 40 people at our school. The number of zombies doubles
every 20 minutes. Write an equation that models this. How many zombies are there after 3 hours?
6) A population of 400 triples in size every 6 years. What will the population be in 42 years?
7) A Bacteria culture doubles in size every 8 hours. The culture starts at 430 cells. How many will
there be after 24 hours? After 72 hours?
Unit 5 – Exponential Functions
Name ________________________
Exponential Growth & Decay Practice
1) A population of 2500 triples in size every year. What will the population be in 30 years?
2) A culture of bacteria doubles every 2 hours. If there are 500 bacteria at the beginning, how many
bacteria will there be after 1 day?
3) A dish has 212 bacteria in it. The population of bacteria will grow by 80% every day.
How many bacteria will be present in 4 days?
4) Suppose a Zombie virus has infected 40 people at our school. The number of zombies doubles
every hour. Write an equation that models this. How many zombies are there after 3 hours?
5) Suppose a Zombie virus has infected 40 people at our school. The number of zombies doubles
every 20 minutes. Write an equation that models this. How many zombies are there after 3 hours?
6) A population of 400 triples in size every 6 years. What will the population be in 42 years?
7) A Bacteria culture doubles in size every 8 hours. The culture starts at 430 cells. How many will
there be after 24 hours? After 72 hours?