he idea of a large, stable middle class (defined as those with annual household incomes in 2010 between $42,000 and $126,000 for a family of three), is central to America's sense of itself. But the U.S. middle class shrank steadily from 61% of all adults in 1971  (t = 0)  to 51% in 2011  (t = 4),  where t is measured in decades. Research has shown that this decline was approximately linear.† (a) Find a linear function f(t) giving the percentage of middle-income adults in decade t, where  t = 0  corresponds to 1971. f(t) =    (b) If this trend continues, what will the percentage of middle-income adults be in 2021?  %

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