I have being doing an old maths test paper to practise and i have done most of it but i am struggling with these last few Q's and i just cnt figure then out! its stressing me out! lol Any help will be much appricated thnx

1) I need to make C the subject of this formula... P= C

_____

C+4

2) We have practised doing algebracic long division, and from x^3+3x+k divided by x-1,it has a reminder of 6. But from this how can i find k?

3)finally, a circle intersepts the line with equation x+y=3 at 2 points, A and B. How can i algebraically find the coordinates of A and B.

and also show that the distance AB is squareroot 162

Thank you!! to everyone that helps!