a If there is a common ratio greater than 1, it represents an exponential growth function. If there is a common ratio less than 1, it represents an exponential decay function.
B
b Use the value of the camper after 4 years.
A
a Exponential decay function
B
b About $15 155
Practice makes perfect
a We have been given a table with the value of a camper over time. We see that the t-values have a common difference of 1, and that the values of the camper have a common ratio of 0.8.
The table represents an exponential decay function, since each time the y-values are multiplied by a number less than 1.
b We know the value of the camper 4 years after it is purchased. To find the value of it after 5 years, we multiply 18 944 by 0.8.
