If a cone with a height of nine inches has volume v= 3 pi x squared + 42 pi x+ 147 pi what is the cones radius r in terms of x

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