Among the variations on the graphs of the trigonometric functions are shifts--both horizontal and vertical. Such shifts are easily accounted for in the formula of a given function. Take function f, where f (x) = sin(x) .
The running costs vary from gas to electric. The average running cost for an electric water heater is $550. The average running costs of a gas water heater is $400. The difference in usage price per year is $150.
Water Heater Cost. Non-discounted retail pricing for: 50 gallon capacity, 11,000 watt electric heater. 0.95 energy factor. 70 gallons per hr recovery rate at 90F temperature rise. 12 yr limited warranty.