Is -0.45 greater than or less than -0.0045?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Corresponding angles are a. always b. sometimes c. never congruent

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