# In 1980, there were 119,000 farms in Iowa. As of

ossidianaZ 2021-08-12 Answered
In 1980, there were 119,000 farms in Iowa. As of 2005, there were 89,000. Find and interpret the average rate of change in the number of farms per year.

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## Expert Answer

liannemdh
Answered 2021-08-13 Author has 20248 answers

To use slope formula, we need two ordered pairs. Here, we let one ordered pair be (1980, 119,000) and the other be (2005, 89,000).

$$\text{average rate of change}=\frac{89,000-119,00}{2005-1980}$$

$$=\frac{-30,000}{25}$$

$$=-1,200$$

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