The student demonstrates a consistent and correct use of mathematical notation, symbols, and terminology throughout the work. Key terms and variables are appropriately defined and explained when first introduced, and the main concepts are effectively described in the introduction, such as those related to the stock market. Multiple forms of mathematical representation are present and used appropriately. The student also explains all mathematical calculations and data presentations. However, the degree of accuracy for rounded values is not consistently stated, and the labeling of graphs, tables, and diagrams needs improvement. Overall, the student effectively applies deductive methods and logical proofs where appropriate, but there are areas for improvement in terms of accuracy and labeling.