Write a cubic equation that describes the data. Select four data points and substitute them into the general form of a cubic equation, f(x) = ax3 + bx2 + cx + d. You will have a system of four equations with four unknowns (a, b, c, and d) to solve.
In 2000, the U.S. Bureau of the Census reported the percentage of the U.S. population that is foreign born.
Year | % Foreign born | Year | % Foreign born |
1900 | 13.6 | 1960 | 5.4 |
1910 | 14.7 | 1970 | 4.8 |
1920 | 13.2 | 1980 | 6.2 |
1930 | 11.6 | 1990 | 7.9 |
1940 | 8.8 | 1998 | 9.3 |
1950 | 6.9 | 2000 | 11.1 |
2005 | 12.1 |
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