Personal Income The income received by people from all sources minus their personal contributions for Social Security insurance is called personal income. The table lists the personal income, in billions of dollars, of people living in the United States for the indicated years.
Year | Personal Income (billions of $) |
1990 | 4847 |
2000 | 8559 |
2004 | 9937 |
2005 | 10,486 |
2006 | 11,268 |
2007 | 11,894 |
2008 | 12,239 |
2009 | 12,026 |
a. Using an input equal to the number of years after 1980, find a quadratic function that models these data.
b. Use your unrounded model to estimate when after 1980 the personal income was $5500 billion.
c. When does the model estimate that the personal income will be double its 2009 value?
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