Restored to factory settings and now have no camera

Just recently purchased an ipad 2 and I restored it so that the other persons info and everything was off of there, but after I had restored it, I no longer have the camera , photobooth, or facetime apps. I have tried searching for the apps on itunes and cannot fine the same ones. I have also download some other photo apps and when I go to click on the take a photo button it exits and puts me back at the home screen. I really don't know what else to do. I am able to take screen shots, but cannot find anywhere to take a photo with the cameras.