Answer:
The distance of the right edge of the painting and the right edge of the wall is 8.8 feet.
Step-by-step explanation:
The length of the painting (Art work) is 2.4 feet from left to right.
The wall measures 20 feet from left to right.
Since the painting is hung at the center of the given wall, thus the distance of the right edge of the painting and the right edge of the wall = the distance of the left edge of the painting and the left edge of the wall.
The distance of the right edge of the painting and the right edge of the wall
= 
= 
= 
= 8.8
The distance of the right edge of the painting and the right edge of the wall is 8.8 feet.