b
Explanation:
a. (x-2)/(x-1) =(7/9-2)/(7/9-1)
=-11/9 =11/2 >x
-2/9
b. 7/9+1 =16/9 =-8<x
7/9-1 -2/9
c. 1 =9/7 >x
7/9
d. (7/9+1) =16/9 = 16/7 >x
7/9 7/9
The x-ray, MRI, cat scan and robotic surgery require a computer. The thing is about camera pills, is that the video is then uploaded to a computer. I hope I have answered your question XD