Mr. harper's car used 5 gallons of gasoline to travel 150 miles. after he had some work done on the cars engine ,it used it used 6 gallons of gasoline to travel 210 miles. if the price of gasoline was $3.50 per gallon, how much money did mr. harper save per mile after the work was done on the cars engine? (round your answers to the nearest cent.)

3.5$

Step-by-step explanation:r. First we have to let the car travel the same distance before and after the modification.Suppose 210 miles

Before:150/5=30mile/gallon   so we need 210/30=7gallons

After:210/6=35mile/gallon   so we need  210/35=6gallons

The difference is 1 gallon.1 multipy by  3.5$/gallon=3.5$

So 3.5$ is Mr.saved.

( I am not sure  if teh answer is correct.)

b

step-by-step explanation: