X would equal to nine, the work is below. Hope this helped!
Which of Deng Xiaoping's policies was the largest factor in the 1989
Tiananmen Square protests?
--> B. Refusing to allow citizens to influence government decisions
Photographic paper reacts to light to produce the image taken by a camera and stored on film. Darkrooms used red lighting to allow photographers to control light carefully, so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.
