Question

Have vehicles gotten more fuel-efficient over the years? Between 1960 and 1999 the size and shape of automobiles in the United States has changed almost annually. The amount of fuel consumed by these vehicles has also changed. The following table describes the average fuel consumption per year per passenger car in gallons of gasoline.

Answer 1

\[\frac{ 668-520 }{ 1960-1990 }\] solve = -4.93 almost a year old but its never to late (: