What is the student’s error? the student should not have multiplied each expression by two. The student simplified mc001-1. Jpgincorrectly. The student simplified mc001-2. Jpg incorrectly. The student incorrectly simplified mc001-3. Jpg.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

The answer is to reassure the reader about dangers of mad cow disease.