take your advice or accept your advice?

[bosun]

which one sounds ok?
I will take your advice or I will accept your advice or I will follow your advice.

also, which one sounds correct between the following three sentence and why?

1. He will visit you in a week.

2. He will visit you after a week.

3. he will visit you withing a week.

<Moderator note: please post one question per thread. I've created a new thread for the second topic.>

 

[badgrammar]

Remember, each question should get its own thread! But I'll answer the first one here, since it's in the title. To accept someone's advice is, to me, to accept that they offer their advice (as opposed to telling them you do not want any advice from them at all). To take or follow their advice is to do what they have advised you to do...