If x is an integer, which of the following must be an even integer?
A. x2-x-1
B. x2 - 4x + 6
C. x2 - 5x + 5
D. x2 + 3x-8
E. x2 + 2x - 10

The correct answer is wood^4

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. 

Uh whats the