Find the equation of a parabola with vertex (2, -1), opens upward and has focal width of 16.
Find the center and radius of the circle with the equation:

Find the equation of a parabola with focus (3, 4) and directrix y = 1.
Find the equation of a parabola with focus (2, -3) and directrix x = 5.
Find the center and the radius of the circle with the equation:

Find the equation of a parabola with vertex (3, 5) and directrix y = 7.
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