Real-Life Exponential Growth: Models and Graphs for 7th Graders

A bacteria culture doubles in size every hour. If the initial size is 100 bacteria, how many bacteria will there be after 5 hours?

• 1600

• 2400

• 4000

• 3200

A tree grows at a rate of 2 times its height each year. If the tree is 3 feet tall now, what will its height be after 4 years?

• 12 feet

• 36 feet

• 24 feet

• 48 feet

A certain type of investment grows exponentially. If you invest $200 and it doubles every year, how much will you have after 3 years?

• $1600

• $800

• $400

• $1200

A computer's processing speed doubles every 2 years. If the current speed is 1 GHz, what will the speed be in 6 years?

• 16 GHz

• 2 GHz

• 8 GHz

• 4 GHz

A population of rabbits triples every month. If there are currently 10 rabbits, how many will there be after 3 months?

• 150

• 30

• 270

• 100

A certain species of fish doubles its population every 6 months. If there are currently 50 fish, how many will there be after 1.5 years?

• 400

• 200

• 100

• 300

A viral video gets 5 times more views each day. If it starts with 200 views, how many views will it have after 3 days?

• 10000

• 1200

• 25000

• 5000

A savings account earns interest that doubles the amount every year. If you start with $500, how much will you have after 2 years?

• $2000

• $1000

• $1500

• $2500

A plant grows exponentially, reaching 4 times its height in 3 weeks. If it is currently 2 inches tall, what will its height be after 3 weeks?

• 6 inches

• 10 inches

• 8 inches

• 12 inches

A smartphone app's downloads double every month. If it has 1,000 downloads now, how many downloads will it have in 4 months?

• 20000

• 4000

• 16000

• 8000