To accurately determine the true statement based on the description of the parabola's graph, we should analyze the information given:
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The c-value in the standard form of a quadratic equation \( y = ax^2 + bx + c \) represents the y-intercept. If the parabola opens downwards, the c-value is likely to be the point where the graph intercepts the y-axis.
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The description states that the parabola "curves down from -6 and curves back up to 0," suggesting that the parabola opens upwards after reaching a vertex.
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The options presented include potential c-values and vertex locations. However, since the parabola has not been distinctly identified in terms of its vertex or its intercepts, we cannot definitively say what the c-value is without specific coordinates.
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The statement that "The a-value is negative" could be misinterpreted because if the graph is described as curving down initially, then the opening of the parabola might indicate that the a-value could actually be negative. However, since it then curves back up, the possibility of an upward-opening parabola should negate this.
Given the information provided, it seems most likely that the statement claiming the "a-value is negative" aligns with the description of a parabola that starts downwards. However, if more context clarified that the parabola opens upwards after being defined by certain x-values, the correctness of this assumption could change.
Conclusively, the correct statement based on the given information would likely be:
The a-value is negative.