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.
\begin{tabular}{|l|l|l|l|l|l|l|l|l|}
\hline Year, t & 1960 & 1970 & 1980 & 1990 & 1995 & 1997 & 1998 & 1999 \\
\hline \begin{tabular}{l}
Gallons Consumed Per
Passenger Car
\end{tabular} & 668 & 760 & 576 & 520 & 530 & 538 & 544 & 552 \\
\hline & & & & & & & & \\
\end{tabular}
Determine the average rate of change, in gallons of gas per year, from 1995 to 1997.
a. [tex]\frac{\Delta t}{\Delta g}=-0.25[/tex] gal/year
b. [tex]\frac{\Delta s}{\Delta g}=0.25[/tex] gal/year
c. [tex]\frac{\Delta g}{\Delta l}=4[/tex] gal/year
d. [tex]\frac{\Delta g}{\Delta s}=-4[/tex] gal/year
Answer (2)
He was motivated by the fame and fortune that he would get if he discovered new lands. The queen of Spain had also promised that he could rule any lands he found.
Columbus appealed to Ferdinand and Isabella's motives of spreading Christianity, gaining economic wealth, enhancing national prestige, and competing with Portugal to secure their support for his expedition. His persuasive arguments combined religious zeal with the promise of riches and glory for Spain. Ultimately, this blend of motives successfully convinced the Spanish rulers to finance his voyage in 1492.
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