The average price (in cents) per gallon of unleaded gasoline in the United States for the years

Question:

The average price (in cents) per gallon of unleaded gasoline in the United States for the years 2010 to 2019 is shown in the following chart. Find the average rate of change per year in the average price per gallon for each time period.
(a) 2010 to 2012 

(b) 2012 to 2019
(c) 2010 to 2019

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