The graph of the revenue function f(x) = –2x2 + 100x is shown to the left. In the function, revenue is dependent on the number of items sold, x. How do the mathematical and reasonable domains compare? mathematical: −[infinity] < x < [infinity] reasonable: 0 ≤ x ≤ 1250 mathematical: x ≤ 1250 reasonable: 0 ≤ x ≤ 50 mathematical: −[infinity] < x < [infinity] reasonable: 0 ≤ x ≤ 50 mathematical: x ≤ 1,250 reasonable: 0 ≤ x ≤ 1,250.

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. 

Its probably the possible factors tt, tt, tt,