book Maths Puzzle Numerical Ability

how do you graph f(x) = |x| / [[x]] ? when [[ ]] means greatest ingeter function.

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book Other Question

An editorial assistant recieves an 8% raise, bringing her salary yo $42,066. What was her salary before her raise? 4(-3x-5))-(10+4x) Simplify? Can someone help me with this?