book Maths Puzzle Numerical Ability

4(-3x-5))-(10+4x) Simplify? Can someone help me with this?

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book Other Question

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

$13725 = the amount paid after 8.5% tax. What is the original cost?

Thanks,
Tanya