JiinDesigned a secondary mathematics curriculum using the backward design model, aligning learning outcomes, instructional activities, and assessments around the role of quadratic functions in everyday economic decision-making. The core learning experience is an interactive website where students work as a “new employee” team, completing scenario-based tasks that require applying quadratic functions to compare products, analyze costs, and make strategic choices in a competitive market. The site includes interactive tools, real-world case examples, and guided practice activities to strengthen both conceptual understanding and motivation. Prototype available here:link.