Farms The points on the following figure show the number N of U.S. farms (in millions) for...

Farms The points on the following figure show the number N of U.S. farms (in millions) for selected years t.

a. Is the number of U.S. farms a function of the year?

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b. What is f(1940) if N = f(t)?

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c. What is t if f(t) = 2.4?

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d. Write a sentence explaining the meaning of f(2009) = 2.2.