Modeling foreign-born population the figure gives the percent of the U.S. population that was foreignborn for selected years from 1900 to 2007.
(a) Find the cubic function that is the best fit for the data. Use x = 0 to represent 1900.
(b) Find the critical point of the graph of the cubic model for x > 50.
(c) Interpret this point in terms of the percent of foreign-born people in the U.S. population.
