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

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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liannemdh

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).

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

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

$$=-1,200$$