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6. [6 points] The Wellhead price p of natural gas in the United States (in dollars per 1000 fta) on the rst day of each

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6. [6 points] The \"Wellhead\" price p of natural gas in the United States (in dollars per 1000 fta) on the rst day of each month in 2012 is listed in the table below. HEM \"nu-:- m Compute the average rate of change of p (in dollars per 1000 ft3 per month) over the quarterly periods January-March, April-June, and July-September

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