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  Read the following SAT test question and then click on a button to select your answer.

  The quadratic functionis graphed in the-plane above. If for all values of, which of the following could be the coordinates of point?

  Answer Choices

  (A)

  (B)

  (C)

  (D)

  (E)

  The correct answer is C

  Explanation

  The fact thatfor all values ofmeans that the pointis the maximum of the quadratic function, somust be the vertex of the parabola. The parabola intersects the-axis at the pointsand, somust be halfway betweenand. Therefore,. Of the choices, the only one with-coordinate equal tois. Therefore,could be the coordinates of point.

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