Exponential Growth and Decay

Before plugging in the rate (r) into the exponential equation, you should ________.

• divide the % by 100

• multiply the % by 100

• divide the % by 10

• multiply the % by 10

Daniel’s Print Shop purchased a new printer for $35,000. Each year it depreciates at a rate of 5%.

Which formula can be used to find out how much the printer will be worth in 8 years?

A population of fish starts at 8,000 and increases by 6% per year. Which exponential function can be used to find the fish population in 10 years?

A population of fish starts at 8,000 and increases by 6% per year.

What will the fish population be in 10 years?

If the decay rate is 20%, which of the following represent the decay factor?

• 0.2

• 0.8

• 1.2

• 1.8

A flea medicine breaks down at a rate of 20% per hour. This is the rate of decay of the medicine. The initial dose is 60 milligrams. Which of the following represent the equation the models the amount of flea medicine left in an animal?

The value of a car depreciates exponentially. Identify the decay factor is the car was worth $20,000 initially and worth $15,000 after 1 year.

• 1.33

• 0.75

• 0.66

• 0.25

Find the decay factor from the given graph.

Which equation represents the given table?

If the growth rate is 80%, what is the growth factor?

• 0.2

• 0.8

• 1.2

• 1.8