Ace Credits and Master Degrees

[Merlin]

Also i was planning to take my precalculus and some of my upper level courses from saylor, straighterline and study.com. It is better to look for an RA options then for those courses.

You can take any of your non-CS courses from ACE, whether they are upper-level or not. Precalculus is generally not considered part of the core CS courses, but it prepares you for the Calculus series which is generally considered part of the CS curriculum. So. you can take Precalculus from Saylor if you wish. Just be aware that it may not properly prepare you for entry into a Calculus course aimed at CS or engineering majors. Your university may even require you to take their precalc course if they don't accept ACE.

And lastly, my foreign credits looks like a "T" letter grade on my transcript. Could be that a problem when applying for a masters? It does not effect my total GPA. Thanks in advance.

As long as the grad school doesn't have any issue with your foreign credits it should be fine. "T" usually means transfer and transfer credits don't always need grades associated with them. As long as the original transcripts show a letter grade that can be used for GPA purposes, it won't matter.