exam Maths Puzzle Numerical Ability

Find the axis of symmetry:
y = x^2 - x + 10

I can not seem to understand this method, I did look back at some other ones, but felt it confused me even more, help please, thank you!!!

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exam Other Question

Can someone show me how to rationalize the denominator and simplify the following?
sqrt x / sqrt x + sqrt 3 supose you need to use at least $1.00 worth of stamps to mail a package. you have as many $0.3 stamps as you need but only four $0.32 stamps.
a. write a system of inequalities tha