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.
1 The price of gas rose above $4.00 per gallon in 13 states at some point during the year.  The highest one-day national average was $3.79 per gallon on Feb. 27. This was the earliest peak price on record, and the lowest peak since 2010.