Gasoline Prices 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.
Source: U.S. Energy Information Administration.
a. From January to July (the peak)
b. From July to December
c. From January to December
