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A two-dimensional plot of a shaded region. The region is bounded below by the horizontal axis, which is labeled
\(x\text{.}\) The vertical axis is labeled Area. The upper boundary of the region is a curve that contains the points
\((0,0)\) and
\((2,18)\text{.}\) Between these points, the curve is concave up. There is a slider that allows adjustment of the position of a vertical line segment inside the region.