There are approximately 1.2•10 to the 8th power households in the US. If the average house hold holds 400 gallons of water each day , what is the total number of gallons of water used by households in the US each day? Give the best answer in Scientific notation

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected