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.
Top of your list should be a solar water heater, which uses the power of the sun to heat your fresh water supply. A residential solar water heater costs between $8,000 and $10,000. Thatâs likely sufficient for home offices and small commercial spaces, such as converted houses.