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30. Farms in the United States The graph gives the num-
ber of farms in the United States from 1850 to 2000.

(a) Estimate the average rate of change in the number of
farms between (i) 1860 and 1890 and (ii) 1950 and
1970.
(b) In which decade did the number of farms experience the
greatest average rate of decline?

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