Exponential growth and decay

Identify each function as representing exponential growth or decay.
f(x) = 4(0.89)^x

• growth
• decay

• 3

• x

• f(x)

The value of a book is $58 and depreciates at a rate of 7% per year. Write an exponential function to find the value of the book.

• f(t) = 58(0.93)^t

• f(t) = 58(1.07)^t

• f(t) = 58(1.93)^t

• f(t) = 58(.07)^t

• 7.46

• 3.6

• 291.6

• 604.66

Which equation matches the graph?

• y=2(2)^x
• y=2(1/2)^x
• y=2^x
• y=1/2(2)^x