Read each item carefully and encircle the letter of your choice. 1. It refers to an extreme point on a parabola, hyperbola and ellipse. A. vertex B. center C. directrix D. focus 2. The absolute A. difference between the distances from any point to the foci of a hyperbola is constant. B. sum C. product D. quotient 3. Which of the following is a hyperbola? A. x + y - 4x + 6y – 1 = 0 C. 3x + 4y + 12x – 13y + 1 = 0 B. 2y + 6x + 8y – 1 = 0 D. x - y - 4x + 6y + 20 = 0

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