exam Maths Puzzle Numerical Ability

How do I find the missing angles or legnths.

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exam Other Question

Simplify without negative exponents or decimals in the final answer.
x^-1/x-x^-1
Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry). y=x^2-4x

Please assist me with this problem, if you co