The number of U.S. travelers to other countries during the period from 1990 thro

Question

The number of U.S. travelers to other countries during the period from 1990 through 2009 can be modeled by the polynomial function. P(x) = -0.00550x^3 + 0.1045x^2 + 1.348x + 46.61 where x = 0 represents 1990, x = 1 represents 1991, and so on and P(x) is in millions. Use this function to approximate the number of U.S. travelers to other countries in each given year. (a) 1990 (b) 2000 (c) 2009 (a) In 1990, the number of U.S. travelers to other countries was approximately million. (Simplify your answer. Type an integer or decimal rounded to the nearest tenth as needed.) (b) In 2000, the number of U.S. travelers to other countries was approximately million. (Simplify your answer. Type an integer or decimal rounded to the nearest tenth as needed.) (c) In 2009, the number of U.S. travelers to other countries was approximately million. (Simplify your answer. Type an integer or decimal rounded to the nearest tenth as needed.)

Explanation / Answer

1990 : x=0 , 2000 x=11 , 2009 x=20

a) substitute x =0 in equation and get

46.61   

b) substitute x=11 in equation and get

66.762 = 66.76

c) substitute x=20 in equation and get

70.97

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