please answer 19-21

19. (4 points) Describe 2 practices techniques or pieces of equipment used to promote healthy ergonomics, explain why they are helpful 1. 2. 20. (2 points) In word processing, the term editing refers to changing or modifying a document's content (correctness and meaning). Give a specific example of a word processing operation you have used which would be considered editing. 21. (2 points) In word processing, the term formatting refers to changing or modifying a document's appearance (layout and design). Give a specific example of a word processing operation you have used which would be considered formatting