Could be either, depending on the context. Formally known, would imply a formal Title, such as The Duke of Edingborough. Formerly known as, implies a previous name or title, such as, formerly known...
Well obviosly a human or a person. Most people call you your real first name. I should say I don't very much know because I'm not you. I bet you can find out yourself if you ask a friend or...
LDL stands for "Low-Density Lipoprotein," but those words don't really mean anything to people besides doctors. All you need to know is that LDL Cholesterol is BAD CHOLESTEROL. It's HDL Cholesteral...