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

Graph f(x) = 4x + 1 How would I write the equation of the line which has y-intercept (0,5) and is perpendicular to the line with equation y = -3x + 1?