Hi Selim, welcome to our forum, please post only 1 question per thread with your attempts at working it out.
This will be best for everyone.
Hello, I recently started Calculus and I was hoping you could help. I will be doing my best to work through them and posting my results here as examples of what (or what not to) do. I'm not a terrific student at this point, which is what prompted me to join this forum, so don't expect amazing work from me.
1. Three point-masses of 100, 80, and 70 kg are located at -3, 2, and 4, respectively, on an x-axis. Find the center of mass.