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Mr M's OCR (not OCR MEI) Core 2 Answers May 2012 <strong><font

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Reply 20

erniiee

Original post by Mr M

yes

For 7ii do you think I would get any marks for root40/7?

Reply 21

Mr M

Study Forum Helper

Original post by AhmedAli95

i said the odd ones are 4 and the even ones are 1/2 so it fluctuates between 4 and 1/2. i also for question seven rounded it to 3 s.f did they want exact values??

fine for the sequence

Q7 had to be exact values

Reply 22

IShouldBeRevising_

Mr m what was r on the last question

a was log base 2 27 ?

Reply 23

J.C

Did you have to state "between 4 and 1/2" or would the word "periodic/repeating" get the mark?

Reply 24

matty b

what are the marks for on q's 9aii, 9bii , 8ii and 7aii? i know there's an answer mark, but what about the method marks?

Reply 25

jodiedoodles

Mr M , for the last question I must have done something stupid somewhere as I worked out y = 6, and substituting this back in got -3 (we wanted 3) . I think I've just messed my signs up somewhere, but I'm pretty sure I done the same working as my friend who got the correct answer as 2/3 (I think?)

Would I still gain method marks, and lose the answer mark? How many marks do you estimate I would lose here?

Thanks!

Reply 26

KoalaKim

Original post by Mr M

Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

4. x = 48.6, 131, 90 degs (6 marks)

i put x =48.6, 90, 131.4

how many marks will i lose?

Reply 27

IShouldBeRevising_

Original post by jodiedoodles

Can you remember what a was was the last questions and what r was?

Reply 28

kenann

Original post by KoalaKim

i put x =48.6, 90, 131.4

how many marks will i lose?

why would you lose any? those values are correct

Reply 29

KoalaKim

Original post by kenann

why would you lose any? those values are correct

but not to 3.s.f

Reply 30

AKayaker

Original post by Mr M

Mr M's OCR (not OCR MEI) Core 2 Answers May 2012

7. (a) (i)

\frac{5 \sqrt{29}}{29}

(2 marks)

(ii)

\frac{-2\sqrt{10}}{7}

(3 marks)

(b)

\frac{3\sqrt{3}}{8}

(3 marks)

Hi Mr M
For the alpha beta question there was a cheat method on the calculator
For the alpha if you did (cos(tan-1(0.4)))^2 the calculator gave you 25/29 so you could just write down the answer as sqrt(25/29)
the same thing also worked for the beta question
This method meant I had hardly any workings, will I get all the marks for the answer, also will I lose marks as I think i forgot to change both down to surds (I left them as 5/sqrt(29) and -sqrt(40)/7 ) as it didn't say in the question it had to be simplified and I stupidly forgot

Reply 31

kenann

Original post by KoalaKim

but not to 3.s.f

the question didn't specify a preference

Reply 32

jodiedoodles

Original post by IShouldBeRevising_

Can you remember what a was was the last questions and what r was?

pretty sure a was log (base 2) 27, r was log (base 2) y

It was definately those two, just can't quite remember which was around!

Reply 33

hannah1994

What were questions 3 and 7 again?

Reply 34

Mr M

Study Forum Helper

Original post by KoalaKim

i put x =48.6, 90, 131.4

how many marks will i lose?

none

Reply 35

jamboogy

Thank you mate. You're a god amongst men.

Reply 36

KoalaKim

Original post by kenann

the question didn't specify a preference

on the front it says all answers to 3.s.f though, hopefully i wont lose any marks for putting it to 4

Reply 37

sj_1995

If, foolishly, I did (3+2x)^5 - (3-2x)^5 instead of plus, would I get any marks? Im sure i read somewhere in an Old OCR mark scheme there was a mark for correct working put incorrect question copying!

Or am I dreaming....

Other than that really happy with the paper!