20. A quadratic function has a vertex located at (6,-6) and a y-intercept of 12. Which equation represents the function in standard form? a. y = 2x2 – 24x+ 66 b. y = 2(x – 6)2 – c. y = 5x2 – 12x +24 d. y = 0.5x2 – 6x + 12 - 6 e. none of the above

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