Your cell phone plan cost $39.99 per month plus $.15 for each text message you send or receive you have at most $45 to spend on your cell phone bill what's the maximum number of text messages you can send or receive next month

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