Exploring Exponential Functions: Growth vs. Decay Quiz

A population of rabbits doubles every year. If there are currently 50 rabbits, how many will there be in 3 years? Is this an example of growth or decay?

• 100 rabbits, this is an example of decay.

• 200 rabbits, this is an example of growth.

• 400 rabbits, this is an example of growth.

• 50 rabbits, this is an example of decay.

A car's value decreases by 15% each year. If the car is currently worth $20,000, what will its value be after 2 years? Identify if this is growth or decay.

• $18,000

• $14,450

• $12,000

• $16,000

A bank account earns 5% interest compounded annually. If you deposit $1,000, how much will you have after 4 years? Is this an example of growth or decay?

• $1,100.00, this is an example of decay.

• $1,500.00, this is an example of growth.

• $1,215.51, this is an example of growth.

• $1,000.00, this is an example of decay.

A bacteria culture grows exponentially. If the initial count is 200 and it triples every hour, how many bacteria will there be after 2 hours? Classify this as growth or decay.

• 1800

• 600

• 2400

• 1200

A tree's height decreases by 2 inches each year due to disease. If it is currently 10 feet tall, how tall will it be in 5 years? Is this an example of growth or decay?

• 7 feet 8 inches

• 9 feet 2 inches

• 8 feet 6 inches

• 10 feet 5 inches

A certain investment grows by 8% each year. If you invest $500, how much will it be worth after 5 years? Identify if this is growth or decay.

• 800.00

• 500.00

• 734.66

• 600.00

The half-life of a radioactive substance is 3 years. If you start with 80 grams, how much will remain after 9 years? Is this an example of growth or decay?

• 15 grams, this is an example of decay.

• 5 grams, this is an example of growth.

• 20 grams, this is an example of growth.

• 10 grams, this is an example of decay.

A savings account has a balance of $1,200 and earns 3% interest annually. How much will be in the account after 6 years? Classify this as growth or decay.

• $1,200.00

• $1,500.00

• $1,800.00

• $1,432.86

A population of fish decreases by 10% each year due to overfishing. If there are currently 1,000 fish, how many will be left after 4 years? Is this an example of growth or decay?

• 400 fish

• 656 fish

• 500 fish

• 800 fish

A smartphone's battery life decreases by 20% each year. If the battery lasts 10 hours when new, how long will it last after 2 years? Identify if this is growth or decay.

• 7.2 hours

• 6.4 hours

• 8 hours

• 5 hours