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.
Electric water heaters typically cost less initially than gas models, but are generally more expensive to operate. Typical costs: Conventional-storage (tank style) electric water heaters typically sell for $250-$2,000 or more from home improvement stores, plumbing supply houses or online retailers. CostHelper readers report paying $588-$1,389, with an average cost of $777, for complete installation of a 40- or 50-gallon conventional storage electric water heater.