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.
According to EIA historical data , from October 2012 to March 2013 the average price per gallon for residential heating oil varied from $3.969-$4.175, or about $910-$1,000 to refill a 275-gallon tank and $1,850-$2,100 for a 550-gallon tank; and 10 years ago, from October 2003 to March 2004, the average was $1.344-$1.625 a gallon.