Here are the answers to your questions:
18. Which of the following best summarizes the text Duke Kahanamoku The Father of Surfing?
C. Duke Kahanamoku left behind a legacy and helped introduce surfing to the world.
19. What is the central idea of Duke Kahanamoku The Father of Surfing?
A. From a young age, Duke Kahanamoku worked on his love of surfing, so much so that he was able to teach others to love it as well.
20. How is the focus of Duke Kahanamoku different from the focus of Surf's Up? Select two options.
A. Duke Kahanamoku focuses only on the life of Kahanamoku.
B. Duke Kahanamoku mentions the many accomplishments of Kahanamoku, Surf's Up does not.
21. How is the information in the two texts similar?
C. Both texts have a topic related to surfing.
These answers reflect the main points from each text and how they relate to each other.