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? %
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? %
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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The 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
(b) If this trend continues, what will the percentage of middle-income adults be in 2021?
%
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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