I forgot how to do summations... I've been googling all day, but I can't find resources good enough for the types of problems I have. If anyone can provide me with some resources, I'd really appreciate it. 1. The problem statement, all variables and given/known data 10087 Ʃ6n+8 i=4 I'm just going to call that S 2. Relevant equations Ʃ of i = 1 to n is n(n+1)/2 3. The attempt at a solution I know I can separate the two terms: S6n + S8 And then pull the constants out? 6n*S1 + 8S1 But can I use 1 as the new constant or do I have to use 4 since that is the index? Do I just multiply 4 by 10087? Or 1 by 10087 and then subtract... something? I don't know, the index of 4 is really throwing me off.