Mr M’s Edexcel GCSE Mathematics A Higher Linear Paper 2 Answers June 2012

Mr M’s Edexcel GCSE Mathematics A Higher Linear Paper 2 Answers June 2012


1. Parallel lines

133 degrees

Angles on a straight line sum to 180 degrees

Corresponding (or alternate) angles are equal (3 marks)


2. Calculator

a) 43.736 (2 marks)

b) 40 (1 mark)


3. Questionnaire

a) Any two of: overlapping time periods; no option for more than 4 hours; no option for 2-3 hours; doesn’t say time period (2 marks)

b) Improved question with non-overlapping boxes and a time period specified (2 marks)


4. Linear graph

Correct graph drawn (3 marks)


5. Garden

5 boxes - full working needed (5 marks)


6. Potatoes

Farm shop - full working needed (4 marks)


7. Scatter graph

a) Negative (1 mark)

b) 11 km (2 marks)


8. Transformations

a) Correct rotation (right angle at (4, -1)) (2 marks)

b) Correct enlargement (right angle at (7, 2)) (3 marks)


9. Holiday money

51 (3 marks)


10. Inequalities

a) -1, 0, 1, 2, 3 (2 marks)

b) $x < 3.25$ (2 marks)


11. Trial and improvement

4.6 (4 marks)


12. Biased dice

120 (2 marks)


13. Mean from frequency table

28.25 minutes (4 marks)


14. Algebra

a) $p^2+5p-36$ (2 marks)

b) $w=-2$ (3 marks)

c) $(x+7)(x-7)$ (1 mark)

d) $3x^4y^{\frac{3}{2}}$ (2 marks)


15. Water meter

Yes he should get the meter - full working needed (5 marks)


16. Trigonometry

48.2 degrees (3 marks)


17. Compound interest

£6676.72 (3 marks)


18. Pythagoras’ Theorem and trigonometry

16.5 cm (5 marks)


19. Standard form

$4.9 \times 10^{-5}$ (3 marks)


20. Changing the subject

$t=\frac{2d-7}{6}$ (3 marks)


21. Proof

Show expression simplifies to 24n so it is a multiple of 8 (3 marks)


22. Quadratic formula

x = 1.72 or x = -0.387 (3 marks)


23. Sampling

a) (i) Any student has an equal chance of being selected

(ii) Putting names in a hat and drawing them out (or other valid method) (2 marks)

b) 21 (2 marks)


24. Area of triangle

29.3 (5 marks)


25. Biscuits

$\frac{111}{190}$ (4 marks)


26. Vectors

a) b - a (1 mark)

b) 0.75b + 0.25a (3 marks)

Mr M for the lasttt question part B you said the answer is 0.75a + 0.25b, wouldnt 1/4(3b-a) be a more simple response because its factorized

I'm wishing a C will be 56... please PLEASE PLEASE.

In the old spec, was there ever a time when the A* boundary was 150, or around that?

Thanks Mr M.

My questions (very few this time lol)

16) I put cos-1(90xadj/hyp). Stupid me, I forgot the angle wasn't needed, but I put it in and got 60 degrees. How much should I drop?

19) I had 4.88 x 10^-5 I think.

22) I went through the formula, obviously did a step wrong as I came out with two different numbers! How much should I drop?

26a) I had -a+b....not b-a.

It would probably be around the 50 mark.
Hope this helps

would writing using the random button on the calculator for the question about random sampling be right?!

How do you know this? People found the paper easy. Evidently!

I mean overall from both papers

Because even though mark boundaries are constantly changing they never really move huge amounts I.E never normally more then 10-15 marks