Edexcel A2 C4 Mathematics June 2015 - Official Thread

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For the population one I originally did it in degrees but at the bottom of the page (in smaller yet legible writing) I wrote it out again in radians - will I drop marks? Every mark counts at this point...

Reply 3101

aluff

Original post by Paublo

My answers for this paper were:
1) 2+5x/4-25x^2/64
3rt2/2
181/128
2)(2x-3y)/(3x+8y)=dy/dx
+-(24/5,16/5)
3)x=4ln(2)
12+32ln(2)^2-32ln(2)
4) A=5,1,3
p=15
31.82
d=7.46
5)27/32
a=2 b=-5
6)k=4
4pi/3 + rt(3)/2
7) 1/(p-2) - 1/p
0.473
8) x=2 - 1/ln3
area = 13pi/ln3
this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.

I got exactly the same answers and was able to check most of it (not the vectors and a couple of the part a's) on my numerical integration/differentiation/loads-of-useful-**** capable calculator. Plus one this as correct answers.

Reply 3102

s.c.a1

Original post by Igooo

Well I somehow got 8.78 for the shortest distance in the vector question... Used tan of 31.82 and the length of AB, don't know how that could go wrong...

samee dont quite remmeber my answer though what did you get for AB

Reply 3103

Medicjug

I think Im on the riskier cusp of the A* :frown:

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Reply 3104

C++

Original post by Mishy96

Vector question.. Anyone get 60 something degrees.. Originally get 119.. Then minus that from 180?

The answer is around 30°, I believe.

Reply 3105

gajaka

For 8b i got 26/2ln3 and then for some reason decided to sinplify to 26/ln3 , I'd still get majority of the marks right?

Reply 3106

Dylann

Original post by jf1994

Did anyone else use the sine rule for the shortest length vector question?

Hell yeah sine rule ftw. :awesome:

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Reply 3107

anorris13

Original post by dariusghadiali

73/75 estimate for C3 and 61/75 estimate for C4... anyone reckon i could have an a*?

Maybe, but it is likely to very borderline, I am sure you will get 100 for C3, but an A could be 62 on C4, which would only give you 78 ish and not an A*

Reply 3108

Razzamataz179

Original post by Emmi12345

I wanted to do STEP first as well, because I didn't want to be worn out already for it. :frown:

But I had to do French because others from my school were sitting it, so apparently they could've 'told me the questions' even though I had a teacher with me all day, no means of communicating, and about 15 minutes in-between the two exams...

dont you get to stay at school if you have like 6+ hours of exams?

Reply 3109

frozo123

will 45/75 be 55 ums?

Reply 3110

User1686961

Original post by Mishy96

A lot of people got 31.8.. Lets see who is right!

Was to 2dp so 38.82 or something.

Reply 3111

007w20

Original post by nbofni

Am I the only one who found the c3 exam a lot easier than this c4 exam??

Those c3 questions just made sense. C4 on the other hand...

I feel the same, I may get 100UMS in C3 and get less than 80UMS in C4 :angry:

Reply 3112

dandroff

Original post by Dylann

Hell yeah sine rule ftw. :awesome:

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i used pythagoras is that right?

Reply 3113

ThePrestigeUK

Original post by Freddy-Francis

Attachment not found

can you please post this MS in a new thread its hard to find pages here :frown:

Reply 3114

Emmi12345

Original post by C++

I believe calculus requires radians, however, it is possible that the mark scheme accepts use of degrees. I, particularly, believe it will.

Yes, I agree. In the past there was a question which stated that theta had to be strictly in-between 0 and π, but there was an 'alternative method' in the mark scheme which allowed people to use degrees, get a different answer and still get full marks... It wasn't mathematically 'correct', but it seems they let people off.