I got a summer homework packet that covers all of last year's curriculum (Pre-Calc) and the first three chapters of next year's curriculum (Calc). I have no idea what I'm really doing with the calc stuff. I'm trying to teach myself sequences, limits, and derivatives. It was going pretty smoothly until this problem: Find the interval of convergence for: 1 + 4x + 16x^2 + ... A) x < 1/4 B) -1/4 < x < 1/4 C) 0< x < 1 D) x > -1/4 Could some please help me through this? I'm sure this problem is ridiculously easy, but I can't seem to find anything to teach myself how to do it. Sorry if I posted this in the wrong section.