book Maths Puzzle Numerical Ability

please help me. I am trying to find the vertex, domain and range of
y = x^2 - 4x. my graph is not coming out right.

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book Other Question

A bag of fertilizer covers 6000ft2. How many bags are needed to cover an area of 26,000ft2? please help me answer this question immediately. how the set of whole numbers and the set of intergers are similar and how they are different? thanks