Column Space and Linear Combinations Question

I am stuck on how to work out this question.

1) In each case determine whether *b* is in the column space of A, and if so, express **b** as a linear combination of the column vectors A.

http://img13.imageshack.us/img13/5123/47311236.jpg

My answer so far to (b):

http://img189.imageshack.us/img189/9657/banse.jpg

Is someone able to let me know if this column space is correct?

*My main question: If so, how am I supposed to find out if ***b** is in the column space?

Thanks.