Jackie is painting rocks. She paints 7 rocks blue. She paints fewer than 3 rocks red. How many rocks does jackie paint in all?
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The focus is above the directrix, so the parabola opens upward—its vertical scale factor is positive (+1/12). The line of symmetry is x=-5, so the vertex form of the equation will have the factor (x -(-5))² = (x+5)². The choice that meets both these requirements is
D. f(x) = (1/12)(x + 5)² + 2
D. f(x) = (1/12)(x + 5)² + 2