Number of Farms in the U.S. The number of farms in the United States t years after 1925 is...

Number of Farms in the U.S. The number of farms in the United States t years after 1925 is f(t) million, where f is the function graphed in Fig. 26(a). [The graphs of f′(t) and f″(t) are shown in

Fig. 26(b).]

Figure 1

(a) Approximately how many farms were there in 1990?

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(b) At what rate was the number of farms declining in 1990?

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(c) In what year were there about 6 million farms?

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(d) When was the number of farms declining at the rate of 60,000 farms per year?

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(e) When was the number of farms declining fastest?