How to get rid of Facebook contacts on iPhone 5?

Facebook has synced all of my friends to my contacts which is really annoying and I don't want.
I have tried switching off contacts in the Facebook settings, and it is not giving me a group option in contacts so I can't get rid of them either of those two ways.

Why are teenagers so obsessed with depression and anxiety.etc?

I'm a teen myself but I've noticed that a lot of them think depression is cool and having so friends and being "leik so awwwkward! 11!" is great.

As soon as they feel a little bit sad (And I MEAN a little bit) sad or the mother refuses to buy them £100 iPhones they're like "omgzz so depressed", when there's teens who are actually depressed out there who don't say anything about it, but there's a few other teens who just took some unreliable online test who aren't depressed at all or just looked a disorder up and think that just because they have one of two symptoms it means that they have it… I'm not saying that people who have online tests are definitely not depressed, it's best to check with the doctor in case you've diagnosed yourself incorrectly. Self-diagnosing also offends those who have actually been diagnosed. But it really sucks when people are walking around with fresh scars out.

How to convert 18 volts to 5 volts?

I have a 18v drill battery that I want to convert to a iPhone 4s charger (5v) as a backup power source. The drill battery is light weight and holds a long charge and I already have it, so it would be ideal. I also have solder and a spare iPhone usb cord. If anyone can provide me with a Radioshack parts list and some instructions Id appreciate it.

Part 2- Problems with teacher?

I just asked the question about being lied to by a school to get signed up. This is about the teacher i now have.
Our teacher tells the class she often goes 3-4 days without sleeping, and she has a very unpredictable and moody attitude. She is always sitting on a couch texting and using the internet on her iphone, on a dating website looking at potential dates, and laughing at them. She tells us "she's had a long day and do whatever we want" and then just chats with students about her personal life and problems, such as her divorce, guys she dates, and weird and creepy disturbing things like dead people, tragedies, her belief in ghosts, and nothing to do with what we're learning. It upsets me because i'm paying good money for this. What should i do?

Is there an App for this please?

On my iPhone I want to add a picture into a photo. The photo is a pic of me. I want an app where you can add other things into that photo like add it in to put it in that picture. Is there any apps that do it please on iPhone & what's the name
of it?

Running out of space on 13 gb iPhone 4?

I got my cousins old iPhone that was a 16 gb 4 but we got all his memory erased to give to me. It is now 13 gb, I need more space - I deleted all my apps that I don't use and pictures that don't matter. But I've downloaded so many apps then deleted them, what should I do?

What ways are available to get unlimited donuts on Simpsons Tapped Out?

I have got The Simpsons Tapped Out on IPhone 5 and I have been trying but failing to get unlimited donuts. I have tried the following:

1. The Springfield Downs; and

2. Plant a tree.

I will not entertain jail breaking my device so that method I have to say is out. What other methods are available and is there a reason why the 2 methods I'm using do not work? Is there a setting that I need in place before they will work?

I'm desperate so I can then get and have all I want in my Springfield.

Many thanks in advance.

Added (1). The tip from Ash below = DID NOT WORK