In Exercise, classify the following as exhibiting average rate of change or instantaneous rate of change.
Personal Finance—Median Income: The median family income for freshmen entering college from 1980 to 2010 can be modeled by
f(x) = −0.02x2 + 2.42x + 24.89 0 ≤ x ≤ 20
where x represents the number of years since 1980, and f(x) represents the median family income in thousands of dollars. (Source: U.S. Census Bureau.) The rate of change in the median family income for freshmen when x changes from 0 to 12.
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