Finding the Domain Without the Graph. OK, so suppose we don't have the graph of a function to look at like in the last section... Can we still find the domain and range? So, we'll just be doing domains on these -- which is really where the action is anyway. Asking for the domain of a function is the same as asking. What are all the possible x guys.
1 barrel of crude oil = 42 US gallons (159 liters or 35 imperial gallons). It produces from about 35 percent to 42 percent of gasoline or petrol, plus many other products such as kerosene, etc.
So at $100 per barrel of oil on the world market the oil companies are paying $22 dollars per barrel of oil. That figures out to be 52 cents per gallon of gasoline. Add in the refining & distribution cost, using $17 per barrel of oil or $.40 per gallon of gasoline we get $.92 cost per gallon of gasoline.