I believe this is true, because addressing the reader's name is sort of informal and not suitable in a cover letter.
What I usually do to start a thesis or intro is go off with a hook. so start it with why you like to draw. for example: drawing has always played an important role in my life. i want to teach others how to draw so they can understand and enjoy this art...etc, etc
Yes the square root of 24 should be 6
