exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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)] solve system by substitution

4x-12y= 5
-x+ 3y=-1