By using data for selected years from 1950 and projected to 2040, the gross domestic product (GDP), in billions of dollars, of the United States is modeled by

Where x is the number of years past 1950 (Sources: Bureau of Economic Analysis; U.S. Energy Information Administration).
(a) Graph the function for 0 ( x ( 90.
(b) What does the model estimate the GDP was in 2000?
(c) What does the model predict the GDP to be in 2025?

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for 0