exam Maths Puzzle Numerical Ability

Please help me with the following question: Determine the vertex of y=x^2-8x+22. Thank you!

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exam Other Question

need a system of equations for this prob: an airplane flew 4 hours against a wind of 40 km/h. on return he was flowing with the wind and flight was 3 hours. whats speed of airplane in still air. (x+3)/(x-2)<0