Edexcel C4 6666 Legacy Paper June 20 2019 Unofficial MarkschemeWatch this thread
Again, tried my best with this. Really hope it helps.
Also, these methods I've used are absolutely not exhaustive - if you recognise the answer I'm sure you've gained all the marks despite method used.
All in all, a very good last ever C4 paper.
Best of luck on results day! Hoping you guys achieve the grades you wanted for A Level Maths.