The following table shows adjusted gross income that is subject to federal income tax. The following table shows the total gross income (AGI) in trillions of  dollars , reported to the IRS each year.  ( t, denotes tthe time in years since 2009 and A denotes the Total AGI.   FIND the linear model for A as a function of t.    A(t)= Year 2009 2010 2011 2012 AGI (trillions) 7.6 8.1 8.6 9.1

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