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- For numbers 3 - 5, use the following table of values. 2 1 0 -1 -2 f(x) 4. 1 0 1 4 3. Which ordered pair is the vertex? A. (1,1) B. (0,0) C. (-1,1) D. (-2,4) 4. What is the zero of the quadratic function? A. -1 B. 1 C. 2 D. O 5. What is the equation of the quadratic function? A. f(x) = 2x2 B. f(x) = 3x2 C. f(x) = x2 D. f(x) = 4x2 ​