Adjusted Gross Income An individual’s adjusted gross income is the amount of income that is subject to federal income tax. The following table shows the total adjusted gross income (AGI), in trillions of dollars, reported to the IRS in the given year.
Year | 2009 | 2010 | 2011 | 2012 |
AGI (trillions) | 7.6 | 8.1 | 8.6 | 9.1 |
a. Show that the data are linear.
b. Let t denote the time in years since 2009, and let A denote the total adjusted gross income. Find a linear model for A as a function of t.
c. Identify the slope of the linear model you found in part b, and explain its meaning in practical terms.
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