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

expand as much as possible log(10,000x) In the figure below, points C, D, and F are collinear, ACF and CDE are equilateral traingles, and b +d= 90 degrees. Use a two column proof to prove that ABC is a right triangle.