A:
You should be able to buy a simple RCA extension cord - something like this would be perfect:
http://www.bestbuy.com/site/podium-pro-five-25-single-rca-extension-cables-pro-home-new-5rca1-black/1310096431.p?id=mp1310096431&skuId=1310096431
It comes with FIVE 25 foot rca extensions, enough to move all of your speakers (except the front right, which has a different connector on your speakers).
If you just need to extend the rear speakers, you could try this:
http://www.bestbuy.com/site/podium-pro-two-25-single-rca-extension-cables-pro-home-new-2rca1-black/1310110038.p?id=mp1310110038&skuId=1310110038
This one comes with two rca cables - perfect for extending just the rear speakers.