exam Maths Puzzle Numerical Ability

Please help me I am unable to slove this expression.
-9-sqrt108 /3

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exam Other Question

The circumference of a circle is 5/2 pi. What is the diameter of the circle? Problem is:

x - x^2/3 = x^1/3 (??) Fill in the ??. The object is to find the equation that when multiplied by x^1/3 would give the result of x - x^2/3.

I know this has to be something simple, but my brain is fried.