The problem is Find the sum of 4+8+12+16+...+404. I need to not only just add them all and find the answer, but show how to set up the problem, but I am completely lost as to how to even begin. I know the Gauss method for a similar problem, such as 1+2+3+...+100, but I don't know how to make it work for this one. Any advice is greatly appreciated.