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.
Size for size, natural and propane gas-fired heaters cost the same. Prices depend on heater size, which in turn depends on the size of your poolâthe gallons of water to be heated. Gas heaters run $1500-$2500, depending on size and who you buy it from.