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Mr M’s Edexcel GCSE Mathematics A Higher Linear Paper 1 Answers June 2012

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Original post by Wall of sound
Mr M, from a teacher's perspective what do you think the grade boundary will be for a C? Won't they be low because it's the first time they've been sat?


I really don't like to guess. I don't think it will be much different from the previous 1380 Linear specification.
thanks :smile:
Reply 42
Original post by Mr M
There was a parallelogram where the opposite pairs of angles were 2x and 2x and 3x-15 and 2x + 24.


Oh yes, I remember now, thanks :smile:
Original post by Mr M
Quite possibly but I couldn't be certain.


out of both papers added it may not be but 60 and 60 on both papers would be more than enough
Original post by Mr M
x2+3x42x25x+3\frac{x^2+3x-4}{2x^2-5x+3}

and

4x+2+3x2\frac{4}{x+2}+\frac{3}{x-2}



How do you work these out?
Reply 45
Repost
(edited 11 years ago)
Reply 46
Original post by Mr M
I really don't like to guess. I don't think it will be much different from the previous 1380 Linear specification.


Hello the famous Mr M,

For Q2a) I didn't put he needed 30 slabs, I don't remember what I did, I think I converted m to cm, and did something with the areas. But I had the answer as Yes he had enough. How much should I drop?

Q3) For part b, I only worked out the difference in cost for 50 miles....how much will I drop?

Q18) Had 3 as the area....did the enlargment of half though.

Q25) My final answer was something like r^3= 3x^2 ? I made the equations for the volumes equal, and simplified from there. How much should I drop?

Q24) Had it in the form 231/999.
Reply 47
can someone go through the simultaneous equation question with me. im sure i did it right and checked in the mathwatch cd and the method was right but my answer is wrong.
i dont remember the qestion exactly but this is what i did:
times the equations (i think the first on by 4 and the second by 5) and got both equations to have 20x. then subtracted equation 1 from 2. this cancelled the x's and leaft me with 23y=99 i think so y was 99/23.
then did the same to get x. ( i think times by 2 and other by 3) to get 6y and same method.
can someone please explain where i went wrong and if i got any marks, would help if you could post the question?
thanks :smile:
how did people get 170 for the median when it only went up to 90g?
Mr M again would appreciate it if you could answer this.

for 26b. i stretched the graph two places higher but not down would i get any marks?

for 24 i got 281 over 999 would i get any marks?

for 4 i never put mph in the key will i drop a mark?

for question 5 you say medicine, what was that question again?

Finally for question 25 i put something like r= sqr root of 27x over 3 pi, does this sound like i would of wrote any working out down that would grab a mark (i know its a ridiculous question for me to ask).

Thanks
Reply 50
OMG. I honestly found this paper difficult! :frown: Estimating from what Mr M has put up, i think i got between 34-40 marks out of 100, any hope for me getting a C grade?!!
Original post by Mr M
Mr M’s Edexcel GCSE Mathematics A Higher Linear Paper 1 Answers June 2011


1. Questionnaire

a) Suitable table (2 marks)

b) Sample too small OR not representative (1 mark)


2. Paving slabs

a) Yes (he needs 30 slabs) (3 marks)

b) £276.16 (3 marks)


3. Parcels

a) £10 (1 mark)

b) Ed is cheaper than Bill for distances under 20 miles and more expensive for distances over 20 miles. The cost is the same for a distance of 20 miles. (3 marks)


4. Stem and leaf diagram

2 | 9
3 | 1 3 5 6 9
4 | 2 3 3 4 6 8 9
5 | 2 4 5

Key: 2 | 9 = 29 mph (3 marks)


5. Medicine

8 (2 marks)


6. Shortcakes

a) 30 (2 marks)

b) 60 (2 marks)


7. Buses

11.00 a.m. (3 marks)


8. Algebra

a) 6y156y-15 (1 mark)

b) 4x(2x+y)4x(2x+y) (2 marks)

c) h=10tgh=\frac{10t}{g} (2 marks)


9. Rotation

Rotation 180 degrees about (3, 3) (3 marks)


10. Train tickets

Railtickets (65p cheaper) (4 marks)


11. Parallelogram

39 (3 marks)


12. Orange juice

4 (3 marks)


13. Hexagon and octagon

105 degrees (4 marks)


14. Lighthouse and harbour

a) 35 km (1 mark)

b) 110 degrees (1 mark)

c) Position marked 4 cm away on correct bearing (2 marks)


15. Cumulative frequency

a) 170 g (1 mark)

b) Correct box plot (3 marks)

c) Median of group A is higher than that of group B and interquartile range of A is bigger than B or other correct comparisons (2 marks)


16. More algebra

a) m10m^{-10} (1 mark)

b) (x+5)(x2)(x+5)(x-2) (2 marks)


17. Standard form

a) 1 (1 mark)

b) 0.000067 (1 mark)

c) 2.7×10142.7 \times 10^{14} (2 marks)


18. Area of enlarged shape

1.5 (3 marks)


19. Probability tree diagram

a) Missing numbers: 0.6, 0.7, 0.3, 0.7 (2 marks)

b) 0.12 (2 marks)


20. Simultaneous equations

x = 3 and y = -2 (4 marks)


21. Circle theorems

Radius and tangent are perpendicular so angles OBA and ODA are 90 degrees

Angles in a quadrilateral sum to 360 degrees so angles DOB = 130 degrees

Angle BCD = 65 degrees as angle at circumference is half the angle at the centre of the circle (4 marks)


22. Histogram

a) Correct bars (frequency densities 3, 5, 3.6, 1.2) (3 marks)

b) 18 (2 marks)


23. Algebraic fractions

a) x+42x3\frac{x+4}{2x-3} (3 marks)

b) 7x2x24\frac{7x-2}{x^2-4} (3 marks)


24. Recurring decimal

31110\frac{31}{110} (3 marks)


25. Cylinder and sphere

r = 3x (3 marks)


26. Graph transformations

a) Translation 3 units in the positive x direction (2 marks)

b) Stretch scale factor 2 in the y direction (2 marks)


For
15. Cumulative frequency

a) 170 g (1 mark)

How did you get 170? the graph only went along to 90g?
Reply 52
If question 26. stated y=2(fx)

would you not have to shrink it? o_O
Reply 53
Hi, sorry to ask and i don't know if its already been answered, but i used this mark scheme as a guide and found i got a mark of roughly 52 - very roughly what result would this be?
Reply 54
Any ideas what to revise for tomorrow's paper? much appreciated (I think i haven't done too badly!)
Reply 55
Original post by emason
Hi, sorry to ask and i don't know if its already been answered, but i used this mark scheme as a guide and found i got a mark of roughly 52 - very roughly what result would this be?


Probably a B
Reply 56
i'm aiming for a B but after seeing the answers and comparing them to mine ones from the test i'm shocked about how badly i did, i literally can only see like 10 marks right. Any advice on what i can do for 2morrows test I need it ASAP:frown:
Reply 57
]what would you get for 73/100
It tends to be 62-65% for an A, so probably around 124-128/200 for an A overall!
Original post by Coke1
Hello the famous Mr M,

For Q2a) I didn't put he needed 30 slabs, I don't remember what I did, I think I converted m to cm, and did something with the areas. But I had the answer as Yes he had enough. How much should I drop?

Q3) For part b, I only worked out the difference in cost for 50 miles....how much will I drop?

Q18) Had 3 as the area....did the enlargment of half though.

Q25) My final answer was something like r^3= 3x^2 ? I made the equations for the volumes equal, and simplified from there. How much should I drop?

Q24) Had it in the form 231/999.



2a) You didn't need to mention the number 30 as long as the rest of your work was convincing. I can't say how many you might have got without seeing your work.

3b) Think you will get 1 mark

18) 2 marks

25) Probably got 1 mark

24) That isn't right - probably no marks, 1 mark if you are lucky

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