School just started two weeks ago, and Algebra II is all ready really difficult for me. Math has always been my worst subject. Today, my teacher decided to have a quiz, but then he changed his mind and is having it tomorrow. The test is over number sequences, specifically arithmetic sequence and sequence sum. He's also been teaching us about sigma notation. I'd really like some help woth this before the test tomorrow, and any advice is greatly appreciated. I'd really like for someone to maybe show me some problems here and how to solve them or simply get some tips on how to make solving a little easier. I'm sorry for requesting this so close to test day, but I literally just found out about it today.