Can you listen to pandora in a car radio through my Iphone?

I have a 2007 Chevy Colarodo with a MP-3 Radio

I have a regular radio but was able to play Pandora off my HTC phone by buying an adapter cord from best buy. Cord ran around 7ish bucks I think. No more than 11 for sure. My adapter outlet in my 08 camry is in a compartment below radio and next to the cigarette lighter outlets

Of course

  • What are those things that let you play music through the radio in your car? I got my sisters old car and it's older so it doesn't have a way for an iPhone to connect to it. She used to have this thing that you could put into the cigarette lighter (or the little power thing) and you could connect your iPhone to it and the songs would play over the radio but it broke so I want to buy a new one and I don't know what they're called.
  • Pandora won't play through car speakers via USB? I currently drive a 2012 Chevrolet Malibu LT and I usually play Pandora on my iPhone via the USB out which is included in the sound systems inside the Malibu models. For a while everything played perfectly, but not it does not. When I plug it in, my car recognizes that it is plugged in and the name of the Artist and song appear on the sound system like normal. However, it only plays through the speakers on my phone. What is the problem? Should I get a different connection other than USB?
  • Pandora on truck radio through aftermarket USB adapter? I'm just wondering if I bought like a 5 dollar USB adapter could I plug my iphone 5 into it and would it be able to play pandora?
  • Is there a car jack to plug into my iPhone to listen to music in the car? So I have been wanting to listen to music through my iPhone in the car for awhile now since burning CDs is not something I specialize in. Is there a car jack for this so that I can play music over the stereo system? I have a 2004 Volvo XC90 if it helps. -Thanks!