Without any tests, how do I know that the series from 1 to infinity (3/5^k) converges?

I just wanna know if there's an easy way to look at the series without doing any tests (or if anything doing an easy test in your head) that the series (3/5^k) from 1 to infinity converges. I'm taking Calculus 2 and the book pretty much implies this is something you should know off the top of your head. Thanks.

2yr old with tubes submerged ears. She has been hystericly screaming?

She hasnt felt good all week and developed a runny nose a couple days ago. Today in the bath she dunked her head and started screaming so much she wanted out. She fell asleep then woke up hystericly screaming saying her ear hurts. She was inconsolable. Not even m&m's helped. I gave her some tylenol which has seemed to help but im still worried about an ear infection.Or could something have happened to her tubes? Can submersion cause that much of a problem? Poor baby, you can just see it in her eyes she doesnt feel good.

Shia LaBeouf knows who Rory Emerald is! So, who in the Jonas Brothers is Rihanna & Sabrina, the Teenage Witch?

This question confuses me, but if you are asking who Rihanna and Sabrina the Teenage Witch are then... Rihanna is a musician, she sings Umbrella if that helps. Sabrina the Teenage Witch was a T.V. show and later cartoon about a witch who lived with her aunts in the mortal world. Does this by chance have anything to do with the Jonas Brothers live chat? if not just totally ignore I said that, but I was just wondering because they mention both Rihanna and Sabrina in it and you said "who in the Jonas Brothers" so I ume your a fan. Any way, if this makes zero sense, I'm sorry, pretend I never said it!

Heeeeellppppp with physics homework please?

Suppose that a binary star system consists of two stars of equal m. They are observed to be separated by 310 million kilometers and take 4.0 Earth years to orbit about a point midway between them. What is the m of each?

How to punish the ps3 for misbehaving?

My ps3 is being really , and needs to be punished. I go to play online, and it tries to make fun of me and says its under maintenance. Now i know this isn't true, and that my ps3 is just trying to annoy me. Whats the best way to punish it? i want to mentally scar it and make it fear me so that it never misbehaves ever again.

Could i have thyroid issues?

To check your thyroid they will take viles of or blood. Then send it out and test it. Ur doctor should give u his opinion on what he thinks it is and what they plan to do if it is. Youll have to wait a couple days for the results. And if u do have it you prolly be put on pills to help regulate it.

Birth Control ?

Im suppouse to start my new pack tomorow. Is it ok if I start it today. I am on Yasmin... and I want to start early cause my BF is coming home tomorow and i know my period will stop if I start them tonight. Is that ok?