Unit 5 Quiz 1 Review

Is the following function an example of decay or growth?

f(x)=2(0.85)^x

• Exponential Decay

• Exponential Growth

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

• Growth
• Decay
• Linear
• None

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

• Growth
• Decay
• Linear
• None

Identify the y-intercept (initial value) of the function f(x)=2(4)^x.

• 2
• 4
• (2)^x
• 8

Is the following function an example of decay or growth?

f(x) = 2(1.25)^x

• Exponential Growth

• Exponential Decay

The expression f(t)=12(1.5)^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

Which variable represents time in our equation y=ab^x?

• y

• a

• b

• x

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

• SLOPE
• RATE OF CHANGE
• Y-INTERCEPT/ INITIAL VALUE

• COMMON RATIO

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.

What does the "b" represent

• Growth/Decay factor

• Y-Intercept

• X-Intercept

• Initial Value