book Maths Puzzle Numerical Ability

Please help me solve this equation:2x=-x+9

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book Other Question

Please help me perform this operation and simplify
6(16x^4)^(1/3)-5(2x)^(1/3)-2(250x^7)^(1/3)
Dear Sir

We need to work out the area of a chord. Is there an equation for this - I am presuming pi is used somewhere? Any help would be gratefully appreciated.

With kind