This fork of Hello VizHub demonstrates three linked D3.js visualizations. It shows total sales by brand and region in a bar chart, units sold versus sales in a scatter plot, and profit alongside average price in a multi-series chart with bars and a line. The code uses `d3.csv` to load a remote dataset and `d3.scaleBand`, `d3.scaleLinear`, `d3.rollups`, and `d3.schemeTableau10` to bind data to SVG rects, circles, and a path via `d3.axisBottom` and `d3.axisLeft`. A dual y-axis is implemented for the final chart.