How much does a 2011 Ford Fiesta transmission replacement cost?

I’m thinking about purchasing my friend’s 2015 Jeep Grand Cherokee. It runs great, looks great, and he says that he thinks it’s still under warranty. However, that seems like a rather lengthy warranty, so I wanted to double-check. What’s the 2015 Jeep Grand Cherokee warranty?

Lately, my car has been driving strangely and I can smell gas. I called my dad since I know nothing about cars, and he said it’s likely that my fuel injectors need repairing. How much does it cost to fix fuel injectors on my car?

My son drew with a crayon on our car windows. Don't get me wrong, I love that he's a budding artist, but I'd prefer he kept his work confined to more traditional mediums. Unfortunately, it's so waxy that I'm not sure where to start with cleaning. How can we get the crayon residue off?