Education Spending Personal expenditures for higher education rose dramatically from 1990...

Education Spending Personal expenditures for higher education rose dramatically from 1990 to 2008. The chart shows the personal expenditures for higher education in billions of dollars for selected years from 1990 to 2008.

a. Graph the data points or find the first differences to determine if a linear equation is a reasonable model for these data.

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b. If it is reasonable, find the linear model that is the best fit for the data, with x equal to the number of years after 1990.

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c. Use the unrounded model to predict spending in 2012.