I appreciate this site. Keep in mind that you are helping a man who graduated from college in 1994. I took precalculus in 1993 and passed with an A minus. Many years later, I wanted to learn calculus so badly that it became a fever and passion.
I found this great website (MHF) hoping to get help when needed by professionals like yourself. I show my work here. I am not saying solve my problems.
I am completed calculus 1 and 2 through textbook learning and youtube video clips and decided to do likewise with multivariable calculus. I know that I lack certain precalculus skills needed but I have not taken a formal college math course in more than 20 years. Try to be a little patient and understanding. There is no need to be insulting.