1.)Sales of fino aut cigarettes (in milions) in a country are given by y=-11.8987 +355.467x+5333.618, where x is the number of years after 1980. During what years does this model indicate that sales would be at least 7 bilion?
The sales are at least 7 bilion for the years _through__
(Round up to the nearest year as needed.)

2.)

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