2016 May 25th Edexcel Core 2 Questions and answers. [Unofficial mark scheme] 2016

what are your grade boundary predictions?
i got between 70-73 marks how many ums would that be about?

after speaking to all the people I have spoken to maybe 93-96?
for the question where it was 5.75 etc did we have to leave as decimals

Reply 41

dididid

13

Original post by Lola1244

after speaking to all the people I have spoken to maybe 93-96?
for the question where it was 5.75 etc did we have to leave as decimals

thanks and not too sure but i don't think they specifically asked to leave any answer as a decimal

Reply 42

X_IDE_sidf

OP

5

Original post by Lola1244

after speaking to all the people I have spoken to maybe 93-96?
for the question where it was 5.75 etc did we have to leave as decimals

Not specified. Mixed numbers and improper fractions are usually acceptable in the mark schemes. However I gave it as a decimal because it is usually the first answer given on the mark scheme.

I would agree with your UMS predictions.

Reply 43

Hasanalm

12

Original post by X_IDE_sidf

Not specified. Mixed numbers and improper fractions are usually acceptable in the mark schemes. However I gave it as a decimal because it is usually the first answer given on the mark scheme.

I would agree with your UMS predictions.

Wasnt 9a 60x^2m^2? Find the area of the sector right? why do u have some weird answer for 9a?

Reply 44

lolxcat

For the very last question, i differentiated it again, then said as x is positive, the second differential must be positive, so it is a minimum. I didn't give the actual number, you think that's alright?

Reply 45

Middriver

6

I didn't do the test, is 8 written correctly? Would you make it 32(2^2x) -7(2^x) +1 =0 then factorise/quadratic formula?

Reply 46

X_IDE_sidf

OP

5

Original post by Hasanalm

Wasnt 9a 60x^2m^2? Find the area of the sector right? why do u have some weird answer for 9a?

Radians not degrees

Reply 47

Hasanalm

12

Original post by X_IDE_sidf

Radians not degrees

Did it specify radians? Would I still get 2 marks for degrees?

Reply 48

X_IDE_sidf

OP

5

Original post by Hasanalm

Did it specify radians? Would I still get 2 marks for degrees?

no because

\frac{1}{2} \theta r^2

only works if theta is in radians.

Reply 49

lolxcat

Original post by Hasanalm

Did it specify radians? Would I still get 2 marks for degrees?

The formula for the area of a sector only works with radians

Reply 50

natolevel

Thanks for getting this together OP. Just thought I'd convert it into a slightly more portable format. Hope it's of use :smile:

C2 Edexcel 2016 Solution.pdf199.3KB

Reply 51

chrismcf

Original post by Hasanalm

Did it specify radians? Would I still get 2 marks for degrees?

The 1/2*r^2*theta formula is only for radians I think

Posted from TSR Mobile

Reply 52

X_IDE_sidf

OP

5

http://www.thestudentroom.co.uk/showthread.php?t=4117823 <-- If you want a better breakdown of the answers go here.

Reply 53

X_IDE_sidf

OP

5

Original post by natolevel

Thanks for getting this together OP. Just thought I'd convert it into a slightly more portable format. Hope it's of use :smile:

Cool, thank you.

Reply 54

X_IDE_sidf

OP

5

Ok as per

Original post by natolevel

Thanks for getting this together OP. Just thought I'd convert it into a slightly more portable format. Hope it's of use :smile:

I decided to neaten it up and make a LaTeX PDF myself, Here it is:

unofficial-mark-scheme.pdf113.3KB

Reply 55

natolevel

Original post by X_IDE_sidf

Ok as per

I decided to neaten it up and make a LaTeX PDF myself, Here it is:

Ah nice that looks better, mine was a bit thrown together.

Thanks again for doing this, I came out of the exam worrying that I'd messed up but these solutions made me realise it hadn't gone that badly.

Reply 56

lady_silon

1

Original post by dididid

the answer was b= (3a+5)/9

I swear it was (a-5)/9

Reply 57

lady_silon

1

Original post by lolxcat

For the very last question, i differentiated it again, then said as x is positive, the second differential must be positive, so it is a minimum. I didn't give the actual number, you think that's alright?