exam Maths Puzzle Numerical Ability

DETERMINE THE VERTEX OF y=x2-8x+22.

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exam Other Question

How would I solve y = x + 5 by graphing? y= 1/2x +4

Thanks! The chemical formula for sulfuric acid is h2so4. If the weight of the acid was 1470 grams, how much did the sulfur weight? (h : 1, s : 32, O 16)