Size of Farms in the U.S. Refer to Fig. 2, where f(t) is the mean (average) size of a farm...

Size of Farms in the U.S. Refer to Fig. 2, where f(t) is the mean (average) size of a farm (in acres) t years after January 1, 1900.

Figure 2 Mean size of farms from 1900 to 1990.

(a) What was the average rate of growth in the mean size of farms from 1920 to 1960?

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(b) How fast was the mean farm size rising on January 1, 1950?

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(c) Was the mean farm size rising faster on January 1, 1960, or January 1, 1980?