exam Maths Puzzle Numerical Ability

Use the Law of Sines or Cosines:
Standing at the corner of the Eiffel Tower, you measure to the top and find the angle of elevation is 85.361 degrees. If the distance from the cor

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Please help...my original problem is: 2(x-5)^2 = 3.

I think the answer is: x= 10 (plus/minus) sq.rt.6 / 2....am I on the right track?

Thank you for your help! m^3-MN^2/MN^2+M^N-2M^3