Real-Life Exponential Growth: Models & Graphs for 7th Grade

A bacteria culture doubles in size every hour. If you start with 5 bacteria, how many will there be after 4 hours?

• 160

• 80

• 10

• 40

A car's value decreases by 20% each year. If the car is worth $15,000 now, what will its value be in 3 years?

• $5,000

• $10,000

• $7,680

• $12,000

A tree grows 3 times its height every year. If it is currently 2 feet tall, what will its height be after 2 years?

• 6 feet

• 24 feet

• 12 feet

• 18 feet

A population of rabbits triples every month. If there are initially 10 rabbits, how many will there be after 5 months?

• 3000

• 1200

• 1500

• 2430

A savings account earns 5% interest compounded annually. If you deposit $1,000, how much will you have after 2 years?

• 1150.00

• 1102.50

• 1200.00

• 1050.00

A certain species of fish can reproduce every 3 months, doubling their population each time. If there are 8 fish now, how many will there be in 1 year?

• 64

• 32

• 256

• 128

A smartphone's battery lasts for 2 days on a full charge. If the battery life decreases by 10% each month, how long will it last after 6 months?

• 150 days

• 2 weeks

• 1.186 days

• 1 month

A viral video gets 4 times more views each day. If it starts with 100 views, how many views will it have after 3 days?

• 8000

• 400

• 6400

• 1600

A plant grows exponentially, increasing its height by a factor of 1.5 each week. If it is 10 cm tall now, how tall will it be in 4 weeks?

• 30 cm

• 40 cm

• 50.625 cm

• 60 cm

A city’s population is projected to grow exponentially. If the current population is 50,000 and it grows by 10% each year, what will the population be in 5 years?

• 60000

• 75000

• 80526

• 90000