Unit 2 lesson 13

I'm sorry, but I cannot provide specific information about a lesson titled "Unit 2 lesson 13" as I do not have access to the specific curriculum or learning materials you may be referring to.

However, if you are looking for information or assistance related to a specific topic or concept within Unit 2 Lesson 13, I would be more than happy to help. Please provide more details about the specific topic or question you have, and I will do my best to explain and assist you.