two vectors, of magnitudes 20 and 50, are added. which one of the following is a possible answer for the magnitude of the resultant?

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. 

What are the questions 

Hiya, you’re such a nice person. hope you have a great day! : )