Unit 3 Quiz 3: Exponential Functions

In an exponential function, what does the 'a' represent? 

• SLOPE

• RATE OF CHANGE

• Y-INTERCEPT

• COMMON RATIO

Is the following function and example of decay or growth?

f(x)=2(0.85)^x

• Exponential Decay

• Exponential Growth

Is the following function an example of decay or growth?

f(x) = 2(1.25)^x

• Exponential Growth

• Exponential Decay

What type of function does this table represent?

• Linear

• Exponential

• Neither

What is the equation for the table?

• y = 4(2)^x

• y = 2(4)^x

• y = 2(8)^x

• y = -2(4)^x

A new savings account is opened with $400 and gains 3% every year. What is the exponential function?

• f(x)=400(1+3)^x

• f(x)=400(1-0.03)^x

• f(x)=400(1+0.03)^x

• f(x)=400(0.03)^x

The original value of a painting is $1400, and the value increases by 9% each year. Write an exponential growth function to model this situation.

• y=1400(1.09)^x

• y=1.09(1400)^x

• y=1400(.91)^x

• y=1.09^x

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

• $y=250\left(1+.15\right)^x$

• $y=250\left(1-.15\right)^x$

• $y=250\left(.15\right)^x$

• Not enough information

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