book Maths Puzzle Numerical Ability

How many diagonls can be drawn from each vertex of a decagon?

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book Other Question

Find the value of the polynomial x^3-4x when x=-2
Is the answer 0 I need to graph the equation y^3+x^2=8. I got as far as y^3=8-x^2, but I don't know what to do further. I don't know what expression I enter for y o obtain the correct graph.