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After driving 70 miles,Mel used 3.8 gallons of gasoline. After he drove a total of 140 miles,he had used 6.3 gallons of gasoline.
a) Find the average rate of change of miles to gallons for miles [0,70]
b)Find the average rate of change of miles to gallons for miles [70,140]
c) )Find the average rate of change of miles to gallons for miles [0,140].

Answer :

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a) 0.05429 gallon per mile or 18.4 miles per gallon
b) 0.03571 gallon per mile or 28 miles per gallon
c) 0.045 gallon per mile or 22.22 miles per gallon

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