The first chorus consisted of 50 members. Sophocles had 15 members in his chorus.
I don't get it either maybe try google just trying to help
By seeing the format in which the text is written!
Depends on the writing. On an essay or paper, it is best if you refrain from using those, unless given a specific okay from the person giving the assignment.
Noun: a previous statement or proposition from which another is inferred or follows as a conclusion
verb: base an argument, theory, or undertaking on