Answer:
A function is a relation in which each possible input value leads to exactly one output value. We say “the output is a function of the input.” The input values make up the domain, and the output values make up the range.
Yes, you should put a comma.
A comma is usually used in the middle of a sentence to separate two clauses, or right before a conjunction. Since “like” is a dependent clause in this sentence, as “it can be attractive” can stand alone, a comma would be put before it. It may also help to read the sentence and see if there is a natural pause to it.
Answer:
Is B.There is a time and place for everything.
She asked what I was doing when I knocked at the door.