Exponential Functions review

Which does y= 2(.5)^x represent?

• Exponential Growth

• Exponential Decay

Which does y=.5(2)^x represent?

• Exponential Growth

• Exponential Decay

What is the range of this graph?

• y = 6
• (0, -4)
• y > -6
• y < -6

Is this exponential growth or decay?

• Growth
• Decay

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

• y=400(1+3)^x

• y=400(1-0.03)^x

• y=400(1+0.03)^x

• y=400(0.03)^x

A new savings account is opened with $400 and gains 3% every yr. What's the amount after 5 years?

• $415
• $463.71
• $343.49
• $460.12

The value of a car is $15,000 and depreciates at a rate of 8% per year. What is the value after 7 years?

• $800
• $8367.70
• $6600
• $25,707.36

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

Identify the y-intercept (initial value) in the function y = 13(.27)^x

• (.27)^x

• .27

• 13

• 3.51

Identify the common ratio (factor) of the function y=2(4)^x.

• 2

• 4

• (2)^x

• 8