A:AnswerYes it will work. My wife really likes this case since the key board is attached to the case as compared to the other cases that use a magnetic edge to hold the key board to the case.
A:AnswerYou have a gen 3 iPad Air. The slim folio is designed for gen 5 & 6 iPads. The best bet would be to take your iPad to the nearest store that sells the slim folio and ask they if you can try it on your iPad. If it does fit then all the better, it will change the way you work on your iPad.
You can check your model number on this website:
https://support.apple.com/en-us/HT201471#ipadair