Chapter 4.2, Problem 44E

Consumer Awareness An automobile gets 28 miles per gallon at speeds up to and including 50 miles per hour. At speeds greater than 50 miles per hour, the number of miles per gallon drops at the rate of 12% for each 10 miles per hour. If s is the speed (in miles per hour) and y is the number of miles per gallon, then

$y=28e^{0.6-0.012s},s>50$.

Use this information and a spreadsheet to create a table showing the miles per gallon for $s=50,55,60,65,\text{ and }70$. What can you conclude?