Finding the frictional force of a block

[`Rage]

Instead of answering all the questions being asked bfeore i make the topic, I'm just going to show you a scan of what I'm being asked for:

http://img184.imageshack.us/img184/7313/picture123146ut0.png


Basically, I got down the normal force, and Idk if made a mistake when i tried to find acceleration and overall tired myself out with this 1

I just want to know if i made a mistake calculating acceleration or if it's something else i have no idea about

 

[XxBollWeevilx]

It depends on what the object is doing and how it's situated...are we on an incline? Maybe post your givens and what you've done so far.