Help me (10 points )

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

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?