They have 4 different backgrounds and 5 different poses which means you just have to multiply the 4 backgrounds*the 5 different poses to discover how many different pictures you could have at the most.
I would love to help you but I don't have time because I really have to get this assignment done but if someone doesn't answer then later I will but I just want to let you know that your teacher sounds like a terrible person and I am really sorry she put you in that situation