Exponential Functions Practice A

The function given is an example of growth or decay?

 $y=2^x$  

• Growth

• Decay

The function given is an example of growth or decay?

 $y=3\cdot\left(\frac{1}{2}\right)^x$  

• Growth

• Decay

The function given is an example of growth or decay?

 $y=\left(1-0.2\right)^x$  

• Growth

• Decay

The function given is an example of growth or decay?

 $y=100\cdot\left(1+.72\right)^x$  

• Growth

• Decay

Karen bought a car for $24,000. The value of the car depreciates by about 13% each year. Which function below can be used to find the VALUE of her car? 

•  $y=24000\cdot0.13^x$  

•  $y=24000\cdot87^x$  

•  $y=24000\cdot13^x$  

•  $y=24000\cdot0.87^x$  

Tags

CCSS.HSF.LE.A.2

Susan invests $3000 and earns 4% interest, compounded annually. Which function below would calculate her total investment for any year? 

•  $y=3000\cdot\left(1+0.04\right)^x$  

•  $y=3000\cdot\left(1-0.04\right)^x$  

•  $y=3000\cdot0.04^x$  

•  $y=3000\cdot0.96^x$  

The expression 12(1.015)^t models the population of elephants in a wildlife refuge after t years since 1975.
Is the population of elephants increasing or decreasing?

• Increasing
• Decreasing

Tags

CCSS.HSF-IF.C.8B

A collectible car has been going up in price by 10% each year. If the car is already worth $29,000, how much will the car be worth in 5 years?

• $0.29
• $2,900,000,000
• $46,704.79
• $145,000

Tags

CCSS.HSF.BF.A.2

The expression 12(1.015)^t models the population of elephants in a wildlife refuge after t years since 1975.
What does the value 12 represent?

• The predicted increase in number of elephants in the refuge each year.
• The predicted decrease in number of elephants in the refuge each year.
• The number of years it will take for the elephant population to stop increasing.
• The initial amount of elephants in the park.

Tags

CCSS.HSF.LE.B.5

The amount of ibuprofen (medicine for headaches) breaks down by 30% each hour. If a person took a 200 milligram ibuprofen, how much will be left after 3 hours?

• 5.4 mg
• 68.6 mg
• .0054 mg
• 2,400,000 mg

Tags

CCSS.HSF.LE.A.4