Solve each problem. (Modeling) Tuition and Fees From 2004 – 2008,...

Solve each problem.

(Modeling) Tuition and Fees From 2004 – 2008, the average annual cost (in dollars) of tuition and fees at private four-year colleges rose in an approximately linear fashion. The graph depicts this growth with a line segment. Use the midpoint formula to approximate the cost during the year 2006.