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Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by birdjm)
How many marks do you think I will lose for the last question? I integrated the curve correctly, getting 40pi/ln3. But when calculating the volume of the cone I accidentally used (2-1/ln3) and did not use (2-(2-1/ln3)) for the height, so when I subtracted the 2 volumes, I got (67pi-54(pi)ln3)/ln3.
i did the same!!very curious how many marks will i lose....
2. Anyone get 31.82 degrees for the angle in the vectors question???
3. (Original post by ASDuh97)
I put my calculator in degree mode for the population one and got 27 years i think, in radians it wouldv'e been too short of a time wouldn't it?
I did that mate. Think we are wrong...
4. (Original post by aero-1997)
Do you guys think i can get an A* if I have 68-C3 67-C4.

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6. (Original post by birdjm)
How many marks do you think I will lose for the last question? I integrated the curve correctly, getting 40pi/ln3. But when calculating the volume of the cone I accidentally used (2-1/ln3) and did not use (2-(2-1/ln3)) for the height, so when I subtracted the 2 volumes, I got (67pi-54(pi)ln3)/ln3.
Three marks I'm thinking: 1 for not getting the correct cone volume. 2 marks for not getting the correct answer..
7. (Original post by Paraphilos)
100% accurate representation of me during my STEP exam.
8. please could someone show me how they did 3c and how you got the (ln)^2 terms
9. (Original post by monica555)
When u multiply out the bracket it becomes 9xln3 not 9ln3x so u then divide 18ln3 - 9 by 9ln3 to get 2-1/ln3
omg i'm so stupid, thank you
10. (Original post by Emmi12345)
None if you got the right answer. It wasn't imperative that you changed it to 9^x. I personally left it as 3^2x, ended up doing a substitution somewhere along the way and it all worked out fairly quickly and nicely.
no but i also got the wrong answer and im not sure why or how because i did 3^2x=1/ln3 3^2x
11. 67A* 74 100UMS
Easier then last years i think. The vectors was easy. Volume with cone was in last year so people cant be that surprised.

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12. does anyone have pictures of question 5 and 6?? or anyone rmb the what the questions were..
13. How did you get the paper ???? and can you put it in a new thread pls
14. But why doesn't the 8y bit differentiate to -8y? (Not positive?)
15. Anyone get 31.82 degrees for the angle in the vectors question?
16. (Original post by kor97)
bump for those who couldn't find it
you know for question 2) does it matter if the dy/dx is 3y-2x/8y-3x ?
17. (Original post by Emmi12345)
No it's not your fault for picking up on it, haha, you were only trying the defend the person. Well I was temporarily unable to count the words in my French essay at the end of that exam because I was shaking so much after 3hrs of stress... The invigilator came over and was like, "Do you need help counting?" I nearly died. I had a STEP exam right after as well... oh the irony.
i cry for you
did they not let you take step first, id have thought that would be the priority
18. (Original post by joanneeve)
no but i also got the wrong answer and im not sure why or how because i did 3^2x=1/ln3 3^2x
Correct me if I'm wrong... but how does 3^2x=1/ln3 3^2x?
... Or do you mean you integrated it to equal that? Not sure I understand.
19. (Original post by nbofni)
Anyone get 31.82 degrees for the angle in the vectors question???

Yes.
20. (Original post by nbofni)
Anyone get 31.82 degrees for the angle in the vectors question?
yep!

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