Percent of Growth or Decay

If the rate of increase is 5%, what do you plug in for r in the exponential growth?

• 5

• 0.5

• 0.05

• 0.005

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.

What will the fish population be in 10 years?

Is this exponential growth or decay?

• Growth, because of 7

• Decay, because of 1.2

• Growth because of 1.2

• Decay because of 7

Identify the percent increase or percent decrease.

The value of a car is $15,000 and depreciates at a rate of 8% per year. What is the decay factor?

• ^.80

• ^1.08

• .92

• 8

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

• y = 15(35)^x

• y = 15(1.35)^x

• y = 15(0.35)^x

• y = 35(1.15)^x