Multiply the rate per mile by the miles and the appropriate conversion factor.

The car leaked 2.25 cups of oil on the trip to grandma's house.
The standard equation of an ellipse is:
(x/h)^2+(y/k)^2=1 where h and k are the radii of the x and y axis...so
(x/14)^2+(y/10)^2=1 or if you prefer
x^2/196+y^2/100=1