vinshel. If you want help with your homework you could begin by asking 'Can anyone please help me with this question, it's for my homework/study and I'm stuck'. A bit of humility and good manners go a long way, as there are some very knowledgeable people who use this site. People are often quite willing to help when they are asked in a proper manner, but certainly not when you come across as arrogant, as you have with the stream of questions you have posted today.