Respuesta :

9 is D. 10 is A. And 11 is either A or B. I am unsure about that last one...
I hope that helped. if I am wrong please correct me I like to learn from mistakes. but I am pretty sure that they are right...
9. 4:2 which can be simplified to 2:1 which is d)

10. Plug in 4 for x and 55 for y which is a)

11. b)