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

I didn't think they were any harder really so I think the boundaries will be very similar to the previous Linear specification.

What did the first question about the short bread ask?

mr m can i have biased for q1b

MR M- could you please help me by explaing how ... r^3 =3X^2 equals r=3x???? please

MR M- could you please help me by explaing how ... r^3 =3X^2 equals r=3x???? please

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) $6y-15$ (1 mark)

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

c) $h=\frac{10t}{g}$ (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) $m^{-10}$ (1 mark)

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


17. Standard form

a) 1 (1 mark)

b) 0.000067 (1 mark)

c) $2.7 \times 10^{14}$ (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) $\frac{x+4}{2x-3}$ (3 marks)

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


24. Recurring decimal

$\frac{31}{110}$ (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)

Thanks as always, Mr M

Just two questions: For (24), I did it all correctly except at the end, I simplified the fraction incorrectly How many marks would that be?

And for (25), I stupidle decided to write x=r/3 rather than r=3x. I think my working was correct though. How many marks would that be?

Thanks

24) drop 1 mark

25) probably drop 1 mark (you might get away with this and be given full credit)

Hi Mr. M.
Could you please tell me why the paper cannot be released yet if that is the case? Is there anywhere I can download and take a look at the exam? It's not up on the Edexcel website, but when I'm checking how I did in M2/M4 its uploaded the day after on TheStudentRoom.

If you're wondering why I want to see it, it's cause my girlfriend sat the paper and said it was tough, not me

Any reply would be appreciated.

Would the grade boundaries be low if majority of the people who took the test found it hard?