What is the simplest form of the expression (14. 2a + 9. 8b) – (13. 1b – 0. 2a) – (3. 7a + 4. 8b)?.

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. 

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