I kept on getting 1000 and something for that bloody time payments question, even though my working out was proper until then....maybe calculator fucked it
I got Question 16 b) (except part i) and Questions 16 c)
I couldn't get 16 a because i forgot rhombus' have parallel sides.....-.-
Overall, looking at ~93 raw.
Happy
EDIT: for those who couldn't figure out 16 C)
You had to use simultaneous for the two curves, and bring that equation reducible to quadratics
from there, since the circle was touching the sides of the curve at two points, you had to use the discriminant = 0 (using the reducible quadratic) to bring it down to the proven result.