Simple vectors question that I can't seem to get right?

[alexgmcm]

All information pertaining to the question and my attempted solution is here: http://mathbin.net/39295 [Broken]

 

[berkeman]

All information pertaining to the question and my attempted solution is here: http://mathbin.net/39295 [Broken]

It would be better if you could post the question and your work here on the PF, using the PF Homework Help template that you are supplied, rather than making us click through levels of another website.

 

[alexgmcm]

True, but I'd already typed it up there. It seems like the mark scheme might just be wrong as everyone else seems to get the same answer as me.