This is actually fun. First comment is brainliest.

Answer//the law of conservation of mass.;

The answer to your q the total mass is 73

This question is rather vague, but i will try and answers it as best i can.start by being polite, then complement on the attributes that you like about that person. be friendly to her friends. don't be mean to anybody she knows, even if you really don't like them. be yourself, don't try to impress, just be yourself and hope that she likes you.