For example, (x +1)*(x +1) is a term built from the constant 1, the variable x, and the binary function symbols + and *; it is part of the atomic formula (x +1)*(x +1) â¥ 0 which evaluates to true for each real-numbered value of x.
In recent weeks, the U.S. diesel fuel price has been hovering around $4.16 per gallon. LNG is selling for about $2.92 per diesel gallon equivalent, 30 percent less, according to Clean Energy Fuels' current price report, which is updated weekly.
A 2010 survey of large US cities showed the price per gallon ranging from as low as $0.007 per gallon up to as much as $0.05 per gallon depending on location, season and usage. I can go to the grocery store and purchase filtered water from a machine that treats municipal water for $0.25 per gallon, if I use my own container.