Exponential Functions

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

• Exponential Growth

• Exponential Decay

What is y-intercept (initial value) of y = 3(.2)^x ?

• 2

• 0.2

• 3

• 0.6

What type of function is y = 7(5/4)^x ?

• Exponential Growth

• Exponential Decay

Which of the following values shows an initial amount of $15 and an increase of 35% each year?

• y = 15(35)^x

• y = 15(1.35)^x

• y = 15(0.35)^x

• y = 35(1.15)^x

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

• f(x) = 400(1+3)^x

• f(x) = 400(0.97)^x

• f(x) = 400(1.03)^x

• f(x) = 400(0.03)^x

What is the x-intercept of the function y = 2(0.4)^x ?

• (0, 2)

• (0, 0.04)

• (2, 0)

• There isn't one

What is initial value of f(x) = 36(0.24)^x ?

• 24

• 36

• 0.24

• 0.36

What is equation of asymptote of y = 2^x ?

• x = 0

• x = 2

• y = 1

• y = 0

The value of a car that is depreciating can be modeled by f(x) = 4500(0.87)^t . By what percent is the car depreciating each year?

• 87%

• 13%

• 45%

• 4500%

What is equation of asymptote of graph of y = 3(2)^x - 1?

• y = -1

• x = 1

• y = 2

• y = 3