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.
A barrel of oil can produce 42 gallons of gasoline. If the US could cut reduce consumption by 1 billion gallons of gasoline, that would translate to 24 million barrels of oil. Update: Commenter Tom asks whether drilling, transportation, refining and distribution are accounted for in the estimate.