exam Maths Puzzle Numerical Ability

Hi, to finish off what i consider has been a pretty good day for learning, I have one last question.
I have to write the following as a single logarithm.
16 [ln x-2(ln y+2Lnz)]

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exam Other Question

24/4-x^2=6/x+2-3x/x-2 find the equation of a line for this points (4,1) and is perpendicular to the line 2y-3x=4