Yes, trig is a huge part of pre-calculus. Here is the section of Trigonometry that deals with equations and identities: https://www.khanacademy.org/math/trigonometry/trig-equations-and-identities

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Do you mean (-10k+13)/(6k+4)? or is one term -10k, another term (13/6)*k or 13/(6k), and the last term 4? I'm going to assume you mean (-10k+13)/(6k+4) based on what you said about monomial factors...

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3. how does k=0 still make and expression undefined when there are still whole numbers

Mahnoor's response was ALMOST correct, but remember than multiplication/division comes BEFORE addition/subtraction. So it should be: You would do the brackets first, 6 + 8 (27) Then the MULTIPLI...

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3. How do order of operations apply in regard to mutliplication?