1985 average annual cost y dollars tuition and fees public two year colleges

Since 1985, the average annual cost y (in dollars) for tuition and fees at a public two year colleges in the United States has increased about 6.5% per year. In 1985, tuition and fees were an average of $584 per year. a. Write an equation to model the cost of two year colleges. Predict the average annual cost for 2015. b. Predict the average annual cost for the year you plan to graduate from high school.