The Corporate Average Fuel Economy regulations .

Question

In the U.S. are federal regulations intended to improve the average fuel economy of cars and light trucks,( truck, vans, sport utility vehicles) sold in the U.S.The combined car and light truck miles per gallon can be approximated by E = 1.5N + 27, where N is the number of years after 2010. In what year will E be greater than or equal to 48?

Answer 1

E=1.5N+27

1.5N=E-27

N=(E-27)/1.5

N=(48-27)/1.5=11/1.5=7.33...

It will be greater than or equal to 48 in year 8 years after 2010 or 2018.