What is the perimeter of this rectangle? a. 2(x2 − x1) + 2(y2 − y1) b. (x2 − x1)(y2 − y1) c. D. E. 4(y2 − x1)(x2 − y1).

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. 

No must be 16 or 17 then you have to have a parent or guardian to take you out or   a court give written consent to their withdrawal. smh why would you be pregnant at

Frequency is the number of complete oscillations of a wave per second.