In 2008, the price of gasoline in the United States inexplicably spiked and then dropped. The average monthly price (in cents) per gallon of unleaded regular gasoline for 2008 is shown in the following chart. Find the average rate of change per month in the average price per gallon for each time period.

a. From January to July (the peak)

b. From July to December

c. From January to December

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Price 450 400 350 +329. 300 250 200- 150 100 50 435 195 + Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Month