The cases are short but must be answered thoroughly and professionally. There is no set word count and I look for quality over quantity. Typically 2 short paragraphs will answer each question and more than that is fine also. It is important as you answer the questions that you also relate your answers to the concepts in the text as well as support your answers with your reasoning.
For a format, just identify your name, the case and the class at the top of the page. Go ahead and rewrite each question and then provide your answer underneath the question using single spacing for your answer. Should be prepared in Microsoft Word.