According to the US. Department of Agriculture, there were 705 farms in Cheyenne County, Nebraska, in 1987, and 615 farms in 2002.
a. Find a linear function F(t) that gives the number of farms in Cheyenne County as a function of the year.
b. Use your model to find the year in which the number of farms in Cheyenne County will fall to 580.
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