book Maths Puzzle Numerical Ability

I need help on transforming equations. ifu can, e-mail me please!

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book Other Question

The cross section of a large telescope having a diameter of 520 feet and a maximum depth of 55 feet. What is the equation of the parabola?

A){{{y=11/52)x^2}}}x^2

B){{{ y=x+1
y=-2x-4 please help??????