1. The problem statement, all variables and given/known data Hope I named the problem accurately. I'm trying to calculate the average value, and the RMS value of this voltage. 3. The attempt at a solution I've been given the graph, and I know how to calculate average and RMS. That's not the problem. What I am wondering, is if my suggested functions are correct. I have actually solved this before, but that was a year ago, and when I revisit it now, I am not 100% sure. -t? 4-4t? 1-t? Because I was told back then, I believe, that the function for the third domain, which I write is "-t", should be "4-4t" or something similar. Can somebody explain to me why -t does not work, and why 4-4t works? I can see that if I continue that line from 4, past 3, and towards 0, it hits u=4. And since I want it to hit the t-line at t=4... I kinda get it, but.. Still seems weird to me! I could nod in agreement if I saw 1-t as well. Can somebody help me make sense of this?