I need help with these questions?

1 Many annual reports include a historical summary section, which shows key financial data for the past five to ten years. Why would information that is five to ten years old be presented in an annual report? 2 Why are the results of discontinued operations and extraordinary items shown in separate sections at the bottom of the income statement? 3. Why are discontinued operations and extraordinary items shown net of tax? 4 Why would a company choose to split its stock