exam Maths Puzzle Numerical Ability

i am having trouble with functions. could you please help solve this question?

If f(x)=x^3-2x+1 then f(2/3)=

i figured -1/27 was the answer but i am not sure. thanks for your help.

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exam Other Question

Sketch the graph of the soulution set of the system of inequalities.

{ -3 < x < 2
y <0} Find the points for the equation y=-5/6x+2
The possible answers are...
1) (12,-3) (-12/5,0)
2) (0,2) (12/5,0)
3) (12,3) (0,2)
4) (1,2) (2,1)
My answer was (0,2) (-6,