Personal Savings The following table gives Americans’ personal savings rate for selected years from 1980 to 2009.
a. Find a quadratic function that models the personal savings rate as a function of the number of years after 1960.
b. Find and interpret the vertex of the graph of the rounded model from part (a).
c. When after 1990 will the personal savings rate reach 6%?
Year | Personal Savings Rate (%) |
1980 | 9.4 |
1990 | 6.0 |
2000 | 3.4 |
2002 | 3.26 |
2004 | 3.23 |
2006 | 3.39 |
2008 | 3.76 |
2009 | 4.03 |
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