A substantial percentage of the United States population is foreign-born. The bar graph shows the percentage of foreign-born Americans for selected years from 1920 through 2008.
Source: U.S. Census Bureau
The percentage, p, of the United States population that was foreign-born x years after 1920 can be modeled by the formula
p = 0.004x2 − 0.37x + 14.1.
According to this model, in which year will 25% of the United States population be foreign-born? Round to the nearest year.
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