accounting problem

Hi there,
I am very new to accounting

so I was wondering if someone can check my answers for my course work on a worksheet problem.

+++++++
Problem Sheet 3.pdf is the question
and
Class 3 - The Accounting Model.pdf
is my answer to the question
+++++++

If I did somewhere wrong, I would really appreciate you could explain a bit to me.

Thanks so much!

Casper