Exercise 4 Page 284

Let's start by recalling the general formula of exponential growth and exponential decay functions. cc Exponential Growth & Exponential Decay [0.8em] y=a(1+r)^t & y=a(1-r)^tIn both cases, a and r are positive numbers. Let's rewrite the given function to match one of the above formulas.

y=2(0.92)^t

WriteDiff

Write as a difference

y=2(1-0.08)^t

Our function matches the format of exponential decay. Here a= 2 and r= 0.08. y= 2(1- 0.08)^t This means that the rate of decay, also known as the percent of change, is 8 %.