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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by bulkybros100)
how many marks was the volume of revolution question ?
4 marks
2. (Original post by Nightinwind)
can anyone help me out!
72/75 c3
65/75 c4
is that likely to be an a*?/ what ums would each get me?
Grade boundaries come out the day before results day. People can only speculate. You also never know if you've counted your marks correctly or been harsher/more generous than you should, or marks might be allocated differently to how you think.

Having said that, those raw marks look okay. Could be very close.
3. (Original post by Michaelj99)
bloody hell i made stupid mistakes, i messed up differential equation and didnt use ln when i took x to the other side @@ got like 900000 minutes or something lool. also I got volume as (1024/5)(pi) but i know u had to take away the little irrelevant section and i didnt so oops
How many marks do you think you will get for 1024/5pi? I did that too
4. (Original post by sztirmzi)
did you guys use t = π/3 or π/6 for the parametric question? wasn't it strange getting π/3 through x (parametric equation) and π/6 through y (parametric equation)!
t was pi/3
5. (Original post by tiriol)
This initially confused me too! Think I got pi/3 in the end, because this value worked for both the x and y equations and pi/6 only worked for the y equation
If you sub π/3 in both the x and y parametric equation, you got the coordinates they gave. I too got a bit confused on that but that was reassuring to see

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6. for Question 6 on the prove that the integral = k (integral) sin^x i got 1/8 (integral) sec^2x.

WHere did i go wrong and how many marks would i get for part B for carrying the k = 1/8 instead of using k=8?
7. (Original post by Nightinwind)
can anyone help me out!
72/75 c3
65/75 c4
is that likely to be an a*?/ what ums would each get me?
should be 95+84 so a high A
8. (Original post by togerel)
For the last part of the last question, where you had to calculate the coordinates of E, lambda was 2/5 or -2/5, right? Did we then have to plug our values for Lambda into the equation of l2?
yep
9. (Original post by tiriol)
This initially confused me too! Think I got pi/3 in the end, because this value worked for both the x and y equations and pi/6 only worked for the y equation
I found this aswell but i used pi/6 so will i lose most marks for that whole question
10. (Original post by sztirmzi)
Yeah! this is what i got and yes you were supposed to put it in l2 I hope you did
Yes, I did do this Thanks for the clarification!
11. for Question 6 on the prove that the integral = k (integral) sin^x i got 1/8 (integral) sec^2x.

Does anyone know where I went wrong?

and for part b how many marks would i get for carrying the k = 1/8 instead of using k=8?
12. If anyone has decent markshemes for C3, D1 or C4 could you post them? I haven't minded any of them but I've lost so many marks due to running out of time on all of them and I need to work out the chances of me getting the grade I need based on what I did answer. Also ****ed up all the other units but got 236/300 UMS last year so only need 184 from these papers.
13. for co-ordinates of E did anyone get (-3,12/5,9/5) and (-7,28/5,21/5) ?

i worked out how long one "gradient" was which a 5root2 , then the length from P to E which i got a 2root2 then used unit vectors/compared to work out the points
14. I got about C3 68-70
And C4 68-69

Do you think this could get me an A*???
15. (Original post by Student403)
I remember you from Cam/Imperial threads Good to see you again! Hope you're going solid with your offers
Yeah! I remember you. I hope you are solid with your offers as well. I think I am going to end up in Imperial after that STEP exam for Camb as long as I don't mess up my alevel exams. Good luck for results day
16. (Original post by ravichauhan11)
yep
Thanks!
17. (Original post by sztirmzi)
Yeah! I remember you. I hope you are solid with your offers as well. I think I am going to end up in Imperial after that STEP exam for Camb as long as I don't mess up my alevel exams. Good luck for results day
Thanks! Imperial is still world class - you should be proud Good luck to you too!
18. (Original post by shahkr)
How many marks do you think you will get for 1024/5pi? I did that too
I think we'll lose 1/2 marks
19. (Original post by Lia_Fletcher)
hey guys, i made some really stupid mistakes and think i only got 64/75 on C4. if i also got about 71/75 on C3 whats the likelihood of this being A*?
For an A* you need 480/600 UMS and 180+ between c3 and c4. Depending on the difficulty of the papers and the UMS conversions, 71/75 in C3 and 64/75 in C4 could get you an A* provided that you have the required 480 UMS too.

For an A* on average, you need approximately 136/150 raw marks across C3 and C4 combined, but this number may vary.
20. (Original post by Engineerrookie)
And C4 68-69

Do you think this could get me an A*???
yeah probs just over 90 in C3 and maybe 90 or just under in C4 (didn't sit them but seen C3 and judging by people's reactions to C4)

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