Which of the following is the equation for x: ax^2=bx? select all that apply x = a x = b x = 0 x = -b/a x = b/a x = ab

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