Yahoo! answers formatting, styles, etc.?

How do you format an answer or question? Adding things like bold, italics or underlining? Also, hyperlinks: apart from typing the address and hoping it gets converted to a hyperlink automatically, how can I specify the text to be displayed, the path of the link, and possibly even what tooltip to show when the mouse pointer hovers over the hyperlink? Mathematical typing (displaying powers nicely, etc.) ? Any other tips?