The document you uploaded contains a problem set for an introductory mathematics course, focusing on topics such as sets, numbers, Venn diagrams, and complex numbers. Here are the questions present in the document:

1. Set Theory (Subsets and relations):

   • Questions on whether one set is a subset of another, and comparisons between sets such as $A$, $B$, and $C$.

2. Universal Set and Complement:

   • Problems related to the universal set (for a six-sided dice) and finding the complement of a set.

3. Roster Method:

   • Using the roster method to write sets, specifically for whole numbers not being natural numbers, and even natural numbers between 5 and 17.

4. Venn Diagram (Two Sets):

   • A link provided to an interactive tool for working with two-set Venn diagrams.

5. Venn Diagram (Three Sets):

   • A link provided to another interactive tool for working with three-set Venn diagrams.

6. Survey Data Representation:

   • A word problem involving a survey on pets, where you need to represent the results in a three-circle Venn diagram.

7. Interval Notation:

   • Writing interval notation for given line segments.

8. Simplifying Expressions in Complex Number Form:

   • Questions on simplifying expressions involving complex numbers in the form $a + bi$.

9. Further Simplifications of Complex Numbers:

   • Additional simplifications involving complex numbers in the form $a + bi$.

10. Operations with Complex Numbers:

    • Given complex numbers, you are tasked to find their sum, magnitude, argument, and to plot the result on an Argand diagram.

Would you like to focus on any specific question from the document or need help solving any of these problems? Let me know if you'd like to dive into any particular topic or step.