Spoke with the professor and got the solution. Seems like it is just a poorly worded question. The question was worded exactly as I have it in the original post.
Solution:
A=10000/415=24.09 mm2
d=5.54 mm
change in length = 415/207000*350=0.7 mm
change in diameter = 415/207000*(-0.3)*5.54=-0.003...