book Maths Puzzle Numerical Ability

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logbx^2y^3/z^4

I do not understand how to expand this. Could someone help me.

Thank you

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book Other Question

Hey I just sent a matrix question in 2 minutes ago, and it was all lined up when I wrote it, but I realize this box doesn't really accept formatting, so instead of being lined up What are some examples of a non-function to graph on a TI-83 Plus?