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4. Foreign-Born Population. In 1970, only 4.7% of
the U.S. population was foreign-born, while in 2007,
12.6% of the population was foreign-born (Sources:
Annual Social and Economic Supplements, Current
Population Surveys, U.S. Census Bureau, U.S.
Department of Commerce). The quartic function
f(x) = -0.0000007623221x + 0.00021189064x³
-0.016314058x² + 0.2440779643x
+ 13.59260684,
where x is the number of years since 1900, can be
used to estimate the percent of the U.S. population
for years 1900 to 2007 that was foreign-born.
Using this function, estimate the percent of the
population that was foreign-born in 1930, in 1990,
and in 2000.

Sagot :

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