We must do is to graph the following ordered pairs in the Cartesian plane:
 Year    VHS Rentals (in millions)
 2000   10.5
 2001   7.8
 2002   6.3
 2003   5.1
 2004   4.4
 2005   3.6
 2006   3.1
 Then, we must observe the behavior of the graph, to determine if the function is linear or exponential.
 For this case, we observe that the trend is a decreasing exponential function, since, the rate of change of the function is not constant.
 Answer:
 Exponential function
 See attached image.
