book Maths Puzzle Numerical Ability

What is the equation of an ellipse with a foci (-8,0) and (8,0) and the sum of the focal radii is 20?

What is the equation of a parabola witha focus of (2,2) and a vertex (1,2)?

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book Other Question

Why is it important to find the surface area of a bridge? Is 3 1/2 an element of the set of real numbers or naturals?