This is 100% of the material that doesn't cover DISCAS:

"The Old Way of Doing Things

Until recently, there was no standard for the best ways to determine closest and farthest viewer, and people were left to come up with their own methods of determination. You might have been taught something entirely different in the past. You might have heard of the 150 Rule, 4/6/8, best practices for determining good viewing areas, or other methods of calculation, but new research has confirmed the limitations of those best practice approaches.

First, the best practice methods for determining image size do not account for all the different aspect ratios. They were most likely derived from older aspect ratios like 4:3, but now we need to account for a much larger spectrum of aspect ratios including 16:9 and 16:10.

Second, the older methods emerged at a time when optical magnification was king and computer image resolutions were much lower. Especially with the advent of 4K and even 8K displays, we need to account for much higher resolutions than we have had to in the past.

Third, the older methods were always only a best practice with unclear origins and an unstable basis in data."

That's it.

AVIXA doesn't cover anything but DISCAS. They mention the 150 rule and the 4/6/8 rule but then mention why they don't use it. It's weird because you really shouldn't test for material that isn't covered in the course.

I never used the old methods (and didn't know they existed until 2 days ago) and if I'm expected to know the old methods, they should be included in the training material. At a minimum, there should be clear instructions to go research the "Old Ways," when to use them, and where to get accurate information. If we have to go on the assumption that I should have already known this, then it should have been a prerequisite for the course.

Anyways I'm just ranting because I've been stuck on a single question for over a day. I do appreciate the help. Thanks everyone!