exam Maths Puzzle Numerical Ability

I am trying to simplify 2^(2/3)+3(2^(2/3) Can you explain how I would do this?

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exam Other Question

The base of the triangle is 4 inches longer thatn the length of one of the other sides. Use a system of equations to find the length of each side of the triangle. The perimeter of (4x^3-2x^2+x-1) / (x+2)