Television Advertising The cost, in millions of dollars, of a 30-second te...

Television Advertising The cost, in millions of dollars, of a 30-second television ad during the Super Bowl in the years 1990 to 2007 can be approximated by the following piecewise linear function (t = 0 represents 1990):

How fast and in what direction was the cost of an ad during the Super Bowl changing in 2006?