Find the Percent of Growth or Decay

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).

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.

The bear population in a given area is currently 1580. They anticipate the bear population to decrease by 2% each year. Which function represents the population of bears, B, after t years.

• B = 1580(0.02)^t

• B = 1580(1 – 0.02)^t

• B = 1580(1 + 0.02)^t

• B = 1580(1 – 0.2)^t

Marilyn collects old dolls. She purchases a doll for $450. Research shows this doll's value will increase by 2.5% each year. Write an equation that determines the value, V, of the doll t years after purchase.

• V = 450(1 + 0.025)^t

• V = 450(1 – 0.025)^t

• V = 450(1 + 2.5)^t

• V = 450(1 – 2.5)^t

What is the percent growth or decay of the following function?

What is the percentage rate of  growth or decay?

• 12%

• 88%

• .12%

• 112%

• .88%

A used car was purchased for $8,400. The car depreciates at a rate of 5% each month. The starting value is ​ (a)   and there is ​ 5% ​ (b)   which means the scale factor is ​ (c)   .

• $8,400

• decay

• 0.95

• growth

• 0.05

What is the percent growth or decay of the following function?

Which of the following could be represented by A=200(1.1)^t

• I started with $200 and lost 1% per week

• I started with $200 and lost 10% per week

• I started with $200 and gained 1% per week

• I started with $200 and gained 10% per week

Which number shows the percent of change? y = 5(1+.27)^x

• x

• .27

• 5