For the last answer, were the coordinates (-8/3,4/3) and (-16/3,-4/3) right? I think I got those although I may have the signs of the 4/3 part wrong as i cant really remember.
I also got Z=1/2 + 3/2i,
-540n, -540n -60, for the general solution
part iii) of the matrix question to be SF 2 and clockwise 90 degrees,
i think part ii) was SF root2 and rotation 135 degrees anticlockwise
i think n of the next question was 1006
new sum was 13 and new product 64/something -i think the new equation was 25x^2 - 64x +325 or something like that