1- What is the concept of sustainable income? Please describe it in your own words. Can you give an example of what this number may look like by using the income statement of a real-life company?

2-There are different tools for analyzing the financial statements of a company, such as horizontal analysis, vertical analysis, ratios for measuring financial health and profitability, and so forth. Before we begin using these tools, however, it is important to know the purpose of each tool.

Why do we need different tools for analyzing the financial statements? Don't the numbers in the financial statements speak for themselves?