For a student with a hearing impairment I would use a microphone or an FM system. The microphone would be easiest because I as the teacher would just wear it around my neck, and all the students could benefit. If I used an FM system, I would still wear a microphone, but the student would have a small receiver box and an ear piece, and that way, the student can adjust the volume for his/her comfort. For someone with low vision, I would place them in the front of the room so that they could see the board, and give them hard copies of whatever I was presenting so that they could see it better. Also I could provide large print books in the classroom and increase the size of the typing on my handouts to all students to make it easier for that child. For a broken arm, assuming that the right one was their dominant hand, I could provide that student with hard copies of the materials so that they could just focus on what was being said, and review my notes later. I could also assign them a study buddy who could take notes for them for however long their arm was in a cast. I could also allow for homework to be typed because maybe that would be easier then hand writing. For non-communicative autism, I would definitely want to provide them with some sort of ACC device, whether that be a Dynavox or an iPad or whatever, so they would have some sort of mode for communication.