Supplemental Videos This YouTube playlist contains several videos that supplement the reading in this unit. You are not required to watch all of these videos, but I recommend watching the videos for any concepts you may be struggling with.Licenses & AttributionsCC licensed content, OriginalMathematics for the Liberal Arts II. Provided by: Extended Learning Institute of Northern Virginia Community College Located at: https://online.nvcc.edu/. License: CC BY: Attribution.CC licensed content, Shared previouslyImage of Check Mark. Authored by: ClkerFreeVectorImages. License: Public Domain: No Known Copyright.