10.3#5

I have no idea how to format the response for #5 on 10.3, i understand the
process but first vector value is throwing me off.

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It looks like you figured it out ok after all.  But look, finding a vector v orthogonal to some other vectors,  <3,-1,0> and <0,-1,-3>  in this case, only depends on the direction of v. Specifying the particular value of some entry, the first in this case,  is a way of specifying a particular vector in that direction--because it makes it easier for the webwork software to check that the answer is correct