Answer:
14.5 miles per gallon
Step-by-step explanation:
The average rate of change of miles with respect to gallons is
[tex]\frac{differenceinmiles}{gallonsused}[/tex]
= [tex]\frac{30970-30680}{20}[/tex]
= [tex]\frac{290}{20}[/tex]
= 14.5 miles per gallon
