Problem 4 The US Natural gas Consumption. CW) = 0.0001234x² -0.005689x² + 0.08 792x² - 0.5 145x + 1514, where x=6 Corresponds to 1966 and x=20 to 19.60 . " / trillion a) Determine Symbolically if the function, Cox), is add, even or neither. (b) Cualuete ((12) and interpret the result. Evaluate the average rate of change of the consumption function on the interval [12,13] and interpret your resolt.

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