Need-math-help-for-finding-a-linear-function
The idea of a large, stable middle class (defined as those with annual household incomes in 2010 between $39,000 and $118,000 for a family of three), is central to America’s sense of itself. But the U.S. middle class has been shrinking steadily from 61% of all adults in 1971
(
t = 0)
t = 0)
to 51% in 2011
(
t = 4),
t = 4),
where
t is measured in decades. Research has shown that this decline is approximately linear.
â€
Find a linear function
f(
t) giving the percentage of middle-income adults in decade
t, where t = 0 corresponds to 1971.
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