Not gonna lie, I used algebra mid-conversation about a week ago. We were talking about the roaming range of unspayed cats. They typically roam within a 5 mile radius from home. I then had the fortune of remembering the formula for finding the area of a circle and was able to determine that unspayed cats have a home range of 78.5 square miles. That may or may not have been the first time I've used algebra outside of a classroom. I'm 31.