Which conic section is defined by the set of all points equidistant from a fixed point (focus) and a fixed line (directrix)?

A cross-section of a cone parallel to its base produces which conic section?

What is the eccentricity of a parabola?

Which conic section has two foci and the sum of the distances from any point on the curve to the foci is constant?

A cross-section of a double cone that is not parallel to the base or the axis produces which conic section?