1 For this type of function, the domain is all real numbers.  A function with a fraction with a variable in the denominator. To find the domain of this type of function, set the bottom equal to zero and exclude the x value you find when you solve the equation.
Showering to Savings. In an average home, showers are typically the third largest water use after toilets and clothes washers. The average American shower uses 17.2 gallons (65.1 liters) and lasts for 8.2 minutes at average flow rate of 2.1 gallons per minute (gpm) (7.9 lpm). Shower Water Saving Tips Pay attention to the length of time spent in the shower.
Hot water usage estimates: Average shower (8 minutes) = 10 gallons of hot water. Average clothes washer (one load) = 7 gallons of hot water. Average dishwasher (one load) = 6 gallons of hot water. Average kitchen faucet flow = 2 gpm. Average bathroom faucet flow = 0.5 gpm. Average daily usage = 64 gallons of hot water.