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...
Answer:

Step-by-step explanation:
l*w*h

N is the variable I believe.
Answer:
4.6
Step-by-step explanation:
28.888 / 3.14 = 9.2
9.2 / 2 = 4.6
Answer:
F(x)=2x^2
Step-by-step explanation:
Basically, a quadratic function has x^2 in it (standard form ax^2+bx+c with non-zero a). The others have x^3, -x, x^4, etc., which clearly are NOT x^2.