How much is my used saxophone worth?

Im new to the saxophone and im wondering theres this thing called tonguing ? when is it used how it is used ?

• when is it used? how it is used ? and how fast do you play the eight notes put together by a stem?

• Answer:

  In order: 1. Whenever there isn't a slur. AKA almost every note 2. It has numerous uses that are far too long to fit into one answer. 3. The same speed that you play two eighth notes that aren't put together by a stem.