Using us census bureau data since 1870 the average number


Using U.S. Census Bureau data since 1870, the average number of acres per U.S. farm can be modeled with the function

A(t) = -0.000377t3 + 0.1021t2 - 4.731t + 174.3

where t is the number of years past 1870.

(a) Find the years when the model has a relative maximum and a relative minimum.

(b) What changes in our society and in the economy during the last half of the 20th century have caused A(t) to increase then?

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Engineering Mathematics: Using us census bureau data since 1870 the average number
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