Review: exponential function growth and decay

In 1980 there were 900 residents of Sillycity. The number of residents increases by 60% every year. Write an exponential growth function to model this situation.

Tags

CCSS.HSF.LE.A.2

A bicycle depreciates at a rate of 15%. Therese bought a bicycle for $250. Write an exponential function to model this situation.

• Not enough information

Tags

CCSS.HSF.LE.A.2

A bicycle depreciates at a rate of 15%. Therese bought a bicycle for $250.  How much should it be worth 6 years later?

•  $225.00
  

• $28.48
  

• $94.29
  

• $578.27

Tags

CCSS.HSF.BF.A.2

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.

• 2969 people

• 2210 people

• 2092 people

• 290 people

Daniel's Print Shop purchased a new printer for $35,000. Each year it depreciates at a rate of 5%. Use an exponential function to find its approximate value after 8 years.

• $34,863.28

• $23,219.72

• $51,710.94

• $136.72

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.

• 956 students

• 4128 students

• 667 students

• 907 students

 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?

Tags

CCSS.HSF.LE.A.2

Write an equation that models the following situation: Samantha's hair was known to grow very rapidly. It began at a length of 6 in and grew at a rate of 14% a week.

• y=6(0.14)^x

• y=6(1+14)^x

• y=6(1.14)^x

• y=6(0.86)^x

Tags

CCSS.HSF.LE.A.2

Suppose you deposit $3000 in a savings account that pays interest at an annual rate of 4%. If no other money is added or withdrawn from the account, how much will be in the account after 10 years?

• $3122.18

• $4994.50

• $4440.73

• $86,776.40

Tags

CCSS.HSF.BF.A.2