Exponential Growth and Decay Practice

A population of bacteria doubles every hour. If there are 100 bacteria initially, how many will there be after 5 hours?

• 1000

• 2000

• 3200

• 500

If an investment grows by 8% annually, how much will a $500 investment be worth after 10 years?

• $800.00

• $650.00

• $925.60

• $1,083.47

The value of a car decreases by 15% each year. If the car is initially worth $20,000, what will be its value after 5 years?

• The value of the car after 5 years will be $25,000.

• The value of the car after 5 years will be $18,000.

• The value of the car after 5 years will be $12,500.

• The value of the car after 5 years will be $7,724.31.

A radioactive substance decays by 20% each day. If there are 500 grams initially, how much will be left after 3 days?

• 50 grams

• 300 grams

• 450 grams

• 128 grams

Identify an example of exponential growth in the real world.

• Population decline

• Spread of a viral infection

• Decrease in the number of COVID-19 cases

• Growth of a tree

Identify an example of exponential growth in the real world.

• Growth of a tree

• Spread of a viral infection

• Population growth of a country

• Increase in the number of cars on the road

Identify an example of exponential growth in the real world.

• Expansion of a balloon when air is blown into it

• Growth of a tree over time

• Increase in the number of cars on the road

• Population growth of bacteria in a petri dish

Identify an example of exponential growth in the real world.

• The expansion of a balloon

• The growth of a tree

• The lengthening of a person's hair

• The spread of a viral infection

Identify an example of exponential decay in the real world.

• Decay of radioactive materials

• Rising temperature in a greenhouse

• Growth of a population

• Increase in stock prices

Identify an example of exponential decay in the real world.

• Financial investments

• Radioactive decay

• Bacterial growth

• Population growth