Final answer:
Sentences 17 through 19 contribute to the passage by illustrating the process of editing and condensing sentences to make them more concise and effective.
Step-by-step explanation:
Sentences 17 through 19 contribute to the passage by illustrating the process of editing and condensing sentences to make them more concise and effective.
The author uses examples and explanations to show how unnecessary words can be omitted and how transitions can be used to improve the flow of ideas.
These sentences emphasize the importance of clear and concise writing in college assignments.