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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. How many raw marks overall (roughly) do you need to pass A-Level maths?
2. Guys what formulas do we need to know for change of rate? (volume of what?)
3. (Original post by chocolatemonkey7)
if you did that, x would be bigger than 8/9
Yeah um I think I might skip this C4 exam...
4. (Original post by Ripper Phoenix)
your mistake is so evident! your limits!! put the higher one on top ALWAYS!

THIS IS NOT TRUE! He has used the limits the other way round so he would get the negative of the correct answer so the area cannot be negative so its positive! He will still be correct
This is not always the case. If originally you have a higher limit at the top which converts to a smaller limit at the top after using substituition it is okay. You don't always have to have a larger number at the top.

Look at this example when new limits are applied:
http://www.examsolutions.net/a-level...4&solution=8.4
5. (Original post by Skitee)
I'm not sure - personally, I'm planning to do an easy-ish paper this morning just to get myself in the swing of things, whilst not overburdening myself
I think I will aswell; I have a few hours to burn anyway.

Which paper are you doing?

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6. ples can sum1 tech me hoew 2 not mek mistakz in axem?
7. (Original post by Nurishment)
~

Can someone explain b) to me. I don't quite fully understand why you take out a factor of 1000 . Why wouldn't you rearrange 7100 to = 8-9x and solve for x and sub that back in?
Which paper is this from?
8. (Original post by rachelc142)
Good luck everybody :-D stay calm and read the question twice and chillllll

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rah ur kinda peng still
9. (Original post by Ripper Phoenix)
your mistake is so evident! your limits!! put the higher one on top ALWAYS!

THIS IS NOT TRUE! He has used the limits the other way round so he would get the negative of the correct answer so the area cannot be negative so its positive! He will still be correct
This is wrong

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Which paper is this from?
June 2013 (R)
11. Can someone just clarify: this is a PM exam, right?
12. (Original post by Nurishment)
~

Can someone explain b) to me. I don't quite fully understand why you take out a factor of 1000 . Why wouldn't you rearrange 7100 to = 8-9x and solve for x and sub that back in?
X=0.1 so you get root of 7.1. Then just multiply the answer by 10 as the cubed root of 1000 is 10
13. (Original post by Nurishment)
June 2013 (R)
Just sub in 0.1 into your binomial equation and you will get the cubed root of 71/10. The cubed toot of 71/10 is the same as the cubed root of 7100/1000. You then get cubed root of 7100/10, as the cubed root of 1000 is 10. Sub x=0.1 into the binomial expansion and times this by 10 to get the square root of 7100.
14. (Original post by 42000)
Can someone just clarify: this is a PM exam, right?
yes
15. (Original post by 42000)
Can someone just clarify: this is a PM exam, right?
nah bruv its AM. quick u got 21 mins to get there!!
16. (Original post by afarouk96)
nah bruv its AM. quick u got 21 mins to get there!!
Tel him to jog it.

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17. (Original post by physicsmaths)
Tel him to jog it.

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ahahah cheeky morning jog
18. (Original post by TH3-FL45H)
This is wrong

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I thought the t value from the x at the top of the integral should also be put at the top of the integral with respect to t even if its smaller?

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19. (Original post by xy0mz)
I thought the t value from the x at the top of the integral should also be put at the top of the integral with respect to t even if its smaller?

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Yeah it should. The guy I was quoting said that you always put the highest one at the top which was wrong.

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20. (Original post by Tazmain)
This is not always the case. If originally you have a higher limit at the top which converts to a smaller limit at the top after using substituition it is okay. You don't always have to have a larger number at the top.

Look at this example when new limits are applied:
http://www.examsolutions.net/a-level...4&solution=8.4
Your a life saver, thank you understand now!

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