book Maths Puzzle Numerical Ability

find the axis of symmetry for the equation {{{y=(1/2)(x-4)^2+2}}}

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book Other Question

You are buying flowers to hand out at a school dance. Roses cost $30 for a dozen but cost more if bought individually. With the money you have, you can buy 7 dozen and 4 single roses, or 64 single roses. How much is one rose? How much money do you have? (x+2/x-2) / (x^2-4/2x-4)

I don't even know where to begin on this. Could you help?