exam Maths Puzzle Numerical Ability

Explain why the radius of a regular polygon is greater than the opothem.

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118. 3+ 1/x-2 = 2x-3/x-2 what do i do with this equation and how do i work it i do not understand can you please help??? :) thank you for your hard work Solve for x: log(4x + 8) - log 2=1
Im baffled.I have no idea what the second part means or even how to begin.