Exam Maths Puzzle Co-ordinate geometry

How to get the angles inside of a circle which has the arc degrees given.

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Exam Other Question

Given equation: y = x^2 - 4x + 2.
Solve the system of equation for x for y = x^2 - 4x + 2 (substitution method). How do you go about the process of multiplying polynomials by monomials for example.
2(n-3)+n(2-n)=2-n^2