List one factor for evaluating positioning with reference to Image N.

What is the appropriate CR angulation and direction for the position in Image A?

List one factor for evaluating positioning with reference to image G. 

S: __________________________

What view is image A?  Letter B:  Letter C:  Letter D:  Letter E:  Letter F:  What view is image G?  Letter H:  Letter I:  Letter J:  Letter K:  Letter L:  Letter M:

N: ________________________

If the odontoid cannot be demonstrated in the open mouth position, then what position should be performed? 

G:____________________________

L:____________________________

R: ____________________________