Your car's gas mileage is an average of 25 miles per gallon. Let g represent the number of gallons of gas you need to put in your car such that
g (m)=where m is the number of miles you drove. The total cost of filling your car's gas tank is C(x) where C is cost in dollars and x is the number
of gallons purchased.
What does the expression C (g (m)) represent?