You are very unclear on your question. Your link is broken too.
Please read Guidelines for homework forum
In particular,
I) Whenever possible, please post the full questions, including the sub-questions related to the question you are currently attempting
It is indeed tempting to post just part of a question sometimes. However, this leaves out certain critical information about the question that may help us solve it in a faster/more efficient way.
II) Please do not paraphrase the questions
Yes, we know you need to practice your English comprehension summary writing skills. However, paraphrasing do changes the meaning of the question sometimes, leading us to the wrong tracks. (i.e. write out your question in the exact way and manner in which it was presented to you. If possible scan the page.)VI) If possible, state which level you are at
This helps to remind us how deep our explanations or complex our calculations should be in order to be within the scope of your syllabus. =D You do not want some funny theorem which solves your question, but will be rejected by your teacher.
VII) Include your answers if you have them
It will serve as a check for everyone who helps, and reduce the amount of "wrong teachings".