The mean number of viewers of Fox prime-time TV shows was 9.1 million viewers in 2010 and decreased by about 0.8 million viewers until 2014.. Let f(t) be the mean number (in millions) of Fox prime-time viewers at t years since 2010.
a. Find an equation of f.
b. Find f(3). What does it mean in this situation?
c. Estimate the percentage of Americans who were Fox prime-time viewers in 2012. The U.S. population was 312.8 million in that year.