Exploring Exponential Growth: Real-Life Applications for 8th Grade

A population of bacteria doubles every 3 hours. If there are initially 500 bacteria, how many will there be after 9 hours?

• 2000

• 8000

• 4000

• 1000

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

• $12,000

• $5,000

• $7,680

• $10,000

A bank offers an account that compounds interest annually at a rate of 5%. If you deposit $1,000, how much will you have in the account after 5 years?

• 1500.00

• 1276.28

• 1000.00

• 1200.00

A tree grows at a rate of 10% per year. If the tree is currently 4 feet tall, what will its height be after 4 years?

• 7.20 feet

• 4.80 feet

• 6.40 feet

• 5.86 feet

A certain species of fish in a lake grows exponentially. If there are 200 fish now and the population doubles every year, how many fish will there be in 3 years?

• 800

• 400

• 3200

• 1600

A viral video is viewed by 1,000 people on the first day and the views double each subsequent day. How many views will it have on the 5th day?

• 16000

• 8000

• 20000

• 4000

A certain type of investment grows at an exponential rate of 8% per year. If you invest $2,000, how much will it be worth after 10 years?

• 4317.84

• 5000.00

• 3500.00

• 4000.00

A smartphone app has 1,500 downloads on the first day and the downloads increase by 50% each day. How many downloads will the app have after 4 days?

• 4500

• 7000

• 5062

• 3000

A certain bacteria culture grows exponentially. If the culture starts with 300 bacteria and triples every 2 hours, how many bacteria will there be after 6 hours?

• 6000

• 12000

• 8100

• 1500

A savings account has an initial deposit of $500 and earns 6% interest compounded annually. How much money will be in the account after 7 years?

• 650.50

• 742.41

• 800.00

• 600.00