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Mathematics 8 Online
OpenStudy (anonymous):

negative 1 divided by 40 x squared equals y Vertex: (0, 0); Focus: (0, -10); Directrix: y = 10; Focal width: 160 Vertex: (0, 0); Focus: (-20, 0); Directrix: x = 10; Focal width: 160 Vertex: (0, 0); Focus: (0, -10); Directrix: y = 10; Focal width: 40 Vertex: (0, 0); Focus: (0, 10); Directrix: y = -10; Focal width: 10

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