I think the purpose of an author is a new story inspiration.
Distributive propery because you're breaking up the numbers into pieces.
B. Nonessential. Commas are used to set off nonessential (or nonrestrictive) subordinate clauses in sentences. These clauses are not necessary to the basic meaning of the sentence. The nonessential subordinate clause could be omitted from the sentence without changing the meaning of the sentence.
The invitation said for you to go to 117 Donner creek Road in Fresno, but Sinclair couldn't find that address