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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2013 watch

1. (Original post by Z.M.1)
For q4 I simplified it to 3 1/4 instead of 13/4 would I lose any marks? And for q5 if I read the question wrong, and moved the graph 4 in negative x and got 2/(x+4)^2 how many marks would I lose?

Also is the correct sketch for the _)|(_ something like that? Again q5
As the grade boundaries haven't changed since june12 61/72 for a and 54/72 for , what would you expect?

Thank you!
Q4) that's fine

Q5) lose 1 mark

I've provided a link to the correct graph on wolfram alpha a few pages ago.

2. I'm busy again for another hour or so folks. Back later.
3. Hi Mr m for question 7ii.
i left it has x<(equal to)5
also for Q8) I divided by 2
how many marks would i drop?
Thanks
4. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

1. (i) (2 marks)

(ii) (1 mark)

(iii) (1 mark)

2. or (5 marks)

3. (i) (3 marks)

(ii) (2 marks)

4. (i) (3 marks)

(ii) (3 marks)

(iii) (2 marks)

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis (2 marks)

6. (i) Centre and radius (3 marks)

(ii) (2 marks)

7. (i) (2 marks)

(ii) (5 marks)

8. (7 marks)

9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

(ii) OR (either will be marked correct) (3 marks)

(iii) (4 marks)

10. (i) (7 marks)

(ii) Minimum (2 marks)

(iii) (5 marks)

I'll be around to answer questions shortly.
sorry to keep pestering you as you have been an amazing help, but how did you work out number 8 as again got something slightly different. thanks again
5. (Original post by aran0909)
Hi Mr m for question 7ii.
i left it has x<(equal to)5
how many marks would i drop?
Thanks
I would imagine only one mark.
6. (Original post by Majeue)
I would imagine only one mark.
Thanks what about if i divided by 2 on Q8?
7. Mr M, for question 9 part ii) , I stated that the range of values was
-3/2 < x < 1/4 , I also go two solutions for the final question but had a line saying A = (-2,-27) as my final line of working (underlined). How many marks do you reckon I will lose?
8. Does anyone have all of the questions?
People keep on asking for individual ones so it might make sense to put them all up at once! :-)
9. How many marks would I get if I did the right curve but only in the first quadrant (i.e. I didn't put a second curve symmetrical to it on the opposite side of the y-axis)?
10. (Original post by aran0909)
Thanks what about if i divided by 2 on Q8?
If you just left it in the form 3x+y-1/2 = 0, that should only lose the final mark. You'll have to tell me what answer you got.
11. (Original post by Rrobba)
How many marks would I get if I did the right curve but only in the first quadrant (i.e. I didn't put a second curve symmetrical to it on the opposite side of the y-axis)?
You would get 1/2 marks.
12. (Original post by fluker6696)
Mr M, for question 9 part ii) , I stated that the range of values was
-3/2 < x < 1/4 , I also go two solutions for the final question but had a line saying A = (-2,-27) as my final line of working (underlined). How many marks do you reckon I will lose?
For 9ii, you might get 1, or 2 if you're lucky.
For the final, you should only lose 1 mark, or may get full marks.
13. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

1. (i) (2 marks)

(ii) (1 mark)

(iii) (1 mark)

2. or (5 marks)

3. (i) (3 marks)

(ii) (2 marks)

4. (i) (3 marks)

(ii) (3 marks)

(iii) (2 marks)

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis (2 marks)

6. (i) Centre and radius (3 marks)

(ii) (2 marks)

7. (i) (2 marks)

(ii) (5 marks)

8. (7 marks)

9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

(ii) OR (either will be marked correct) (3 marks)

(iii) (4 marks)

10. (i) (7 marks)

(ii) Minimum (2 marks)

(iii) (5 marks)

I'll be around to answer questions shortly.
For K=-5 I worked it out to be -49 I did all the correct working but I put in a negative sign instead of a positive infront of K at one point. I multiplied out the brackets and found dy/dy made it equal to 0 and substituted -3 for x.

Then because this answer was wrong I couldn't do (-2,-27) I did the correct working but stopped when I couldn't find the multiples (because it didn't work) although I did do simultaneous equations and then showed an alternative method of dy/dx up until that point..

Is it possible to get any method marks and if so could you hazard a guess at how many marks I'll lose/get.. Thanks!! I got nearly full marks in the rest of the paper I'm just worried the wrong sign will cost me an A (((((
14. Will I lose marks for not not writing the differentiation answers in a more suitable format? For example I wrote 36x^-4 instead of 36 over x^4 and the same with the other differentiation question.
15. (Original post by aran0909)
Hi Mr m for question 7ii.
i left it has x<(equal to)5
also for Q8) I divided by 2
how many marks would i drop?
Thanks
drop 2 marks and 1 mark respectively
16. (Original post by hayhayhay1)
sorry to keep pestering you as you have been an amazing help, but how did you work out number 8 as again got something slightly different. thanks again
I have provided the question earlier in the thread. Try working it out again?
17. (Original post by fluker6696)
Mr M, for question 9 part ii) , I stated that the range of values was
-3/2 < x < 1/4 , I also go two solutions for the final question but had a line saying A = (-2,-27) as my final line of working (underlined). How many marks do you reckon I will lose?
9ii) you might get 1 mark if you are lucky

full marks on the last part
18. (Original post by Rrobba)
How many marks would I get if I did the right curve but only in the first quadrant (i.e. I didn't put a second curve symmetrical to it on the opposite side of the y-axis)?
drop 1 mark
19. (Original post by Whyllee)
For K=-5 I worked it out to be -49 I did all the correct working but I put in a negative sign instead of a positive infront of K at one point. I multiplied out the brackets and found dy/dy made it equal to 0 and substituted -3 for x.

Then because this answer was wrong I couldn't do (-2,-27) I did the correct working but stopped when I couldn't find the multiples (because it didn't work) although I did do simultaneous equations and then showed an alternative method of dy/dx up until that point..

Is it possible to get any method marks and if so could you hazard a guess at how many marks I'll lose/get.. Thanks!! I got nearly full marks in the rest of the paper I'm just worried the wrong sign will cost me an A (((((
drop 1 mark in the first part and 2 marks at the end
20. (Original post by Maths927384)
Will I lose marks for not not writing the differentiation answers in a more suitable format? For example I wrote 36x^-4 instead of 36 over x^4 and the same with the other differentiation question.
That's fine.

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