Chapter 1.4, Problem 12E

m Miles per Gallon The cost of operating a car depends on the gas mileage in that your car gets, the cost $x$ per gallon of gasoline, and the distance $d$ that you drive.

a. How much does it cost to drive 100 miles if your car gets 25 miles per gallon and gasoline costs 349 cents per gallon?

b. Find a formula that gives the cost C as a function of $m$, $g$, and $d$ be sure to state the units of each variable.

c. Use functional notation to show the cost of driving a car that gets 28 miles per gallon a distance of 138 miles if gasoline costs $3.69 per gallon Use the formula from part b to calculate the cost.