I'm assuming the underlined conjunctions are <em>both </em>and <em>and </em>(because you didn't underline any, and those are the only two conjunctions in the sentence).
Those conjunctions are called correlative conjunctions - this means that they are connecting two items which are equally important. So, this woman saw both Billie Holiday and Ella Fitzgerald - and both of those artists are important to the woman.
Answer: Most likely garbage from trash cans and such
I would have to say formal, mainly because I looked it up on google.
A. This gig
It's important not to use slang in a job application or resume.
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