What is the unit rate of mile to gallon of 30 miles and 1 gallon?

What is the circumference of the pie

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

Which of the following is an irrational number