it's a question from University Of The People MATH 1211 AY2020 T4 Learning Journal Unit 2

Q.- You should write of what parts of the text were the most difficult to read, and to identify how many times a passage was read before some understanding was achieved. Mathematical writing is often not immediately understood, and takes time and thought before comprehension. (End Of Question)

And the Reading Assignment was Chapter 2, 2.1, 2.2, 2.3, and 2.6 from the book at the URL:-

http://ocw.mit.edu/resources/res-18-001-calculus-online-textbook-spring-2005/textbook/