First, let me preface this with I could be very wrong but I’ll try my best to help!
If you’re talking about the “Boolean Algebra and Digital Logic Project 2”, I was in your same boat just a day ago and was able to finish the assessment a couple hours ago! Turns out that you don’t actually need to solve for anything. I believe the X’s represent something called “Don’t Care” cells and it’s actually up to you to set their values to 1 or 0, depending on what makes the problem easier for you. I typically went with the strategy of setting the values of X so I could get the least amount of the largest groups I could in the Kmaps. It’s a little weird at first but watching some videos online and some googling got me there.
I also checked the solution provided for the first 2 problems when I was a little confused and saw right away what I could do so hopefully this all helps!