Percent of Exponential Growth or Decay

Look at the following exponential equation and tell the percent of Growth or Decay;

y = 80(1.15)^x

• 15% Decay

• 80% Growth

• 115% Growth

• 15% Growth

Look at the following exponential equation and tell the percent of Growth or Decay; y = .25(2)^x

• 75% Decay

• 100% Growth

• 25% Decay

• 200% Growth

Which of the following exponential functions represent a 25% Growth?

• y = 3.4(1.25)^x

• y = 1.25(.25)^x

• y = .25(2)^x

• y = 3(25)^x

Which of the following exponential functions could represent a 33% Decay?

• y = 0.8(.33)^x

• y = 3.4(.67)^x

• y = 2(1.33)^x

• y = .33(2)^x

• A

• B

• C

• D

Annual sales for a fast food restaurant are $650,000 and are increasing at a rate of 4% per year. Use an exponential function to find the annual sales after 7 years.

Round to two decimal places (like dollars and cents).

The population of a town is 2500 and is decreasing at a rate of 3.5% per year. Use an exponential function to find the population of the town after 5 years.

Round to the nearest whole number (you can't have a fraction of a person).

The population of a school is 800 students and is increasing at a rate of 2% per year. Use an exponential function to find the population of the school after 9 years.

Round to the nearest whole number.

Kathy plans to purchase a car that depreciates at a rate of 12% per year. The initial value of the car is $21,000. Use an exponential function to find the value of the car after 3 years.

Round your answer to 2 decimal places.

During a certain period of time, about 70 northern sea otters had an annual growth of 18%. Use an exponential function to find the number of sea otters after 4 years.

Round to the nearest whole number.