B) 

d)

9) I'm not really sure how to answer it, but I guess like 2.1, 2.2, 2.5, etc.,
10) 


so {5, 6, 7, 8} is the answer
11) for some reason it won't let me insert a picture but put place 

above 2, and then place 

above 3, and then place 

in between 2 and 3, but place it a little closer to three since 

12) place 

between 2 and three, but closer to two since 

and also 

and for number 13) the square root of 144 is 12, and the square root of 169 is 13, so any numbers between 12 and 13 will work.
I hope this helped and if not, message me and ill try to explain!