This combined chart displays the average car price as teal bars and average horsepower as a magenta line and dots, grouped by cylinder count, with labels for the bar values. The visualization uses React hooks to load and aggregate CSV data with d3.csv and d3.rollup, then renders an SVG via D3 v6 scales, axes, and a line generator. Grid lines, a dual y-axis, and hover effects on bars and dots are included in the dark-themed layout.