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The average annual tuition and fees at public 4-year institutions in the US in 2004 was...

The average annual tuition and fees at public 4-year institutions in the US in 2004 was $13,576 and in 2014 was $18,231. Let y be the average tuition and fees in the year x, where x = 0 represents the year 2004.

a) Write a linear equation that models the growth in average tuition and fees at public 4-year institutions in the US in terms of the year x.

b) Use this equation to predict the average tuition and fees at public 4-year institutions in the US in the year 2020.

c) Explain what the slope of this line means in the context of the problem.

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