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.
Hmm, so maybe instead of thinking about 42 gallons per barrel I should start with 44.6. But, I digress. The EIA tells us that in 2005, 20.8 billion barrels of oil and 9.16 billion barrels of gasoline (385 billion gallons) were consumed. That gives us a ratio of 18.5 gallons per barrel.