Can somebody pls help me with this question I dont get it

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

When you answer this can you explain