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

There are 220 barrels of cement in one shed and 510 barrels in another shed. How many barrels must be transferred from the second to the first shed so that the first shed will cont 1.What is the critical value at the 0.05 level of significance for a goodness-of-fit test if there are six categories?
A) 3.841
B) 5.991
C) 7.815
D) 11.070
E) None of the above