Exponential Functions Test

Which the following graphs shows an exponential decay equation?

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What type of function is f(x)=2(1/7)^x ?

• Exponential Growth
• Linear
• Exponential Decay
• None of the Abovee

Is the pictured graph growth, decay, or linear or none?  

• Growth
• Decay
• Linear
• None

Which of the following is an increasing exponential function whose initial value is 50?

• y = 50(.05)^x

• y = 50x - 4

• y = (2)^x + 50

• y = 50(1.4)^x

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

Solve for b:
4^{3b - 3} = 1/16

• 7
• -1/4
• 1/2
• 1/3

Solve: 9^8-x = 27^x-3

• x = 5
• x = -5
• x = 1/5
• x = -1/5

The population of Winnemucca, Nevada, can be modeled by P=6191(1.04)^t where t is the number of years since 1990. What percent did the population increase each year?

• 4%
• It doesn't say
• I don't know
• 400%

What is the horizontal asymptote for the graph of

f(x)=13(0.5)^x ?

• y=0.5

• y=13

• y=6

• y=0

What is the graph of

 $y=4^x$  ?

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