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

For question 14 b) I'm sure that the answer was 290 degrees not 110 degrees

$\frac{x^2+3x-4}{2x^2-5x+3}$

and

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

For question 14 b) I'm sure that the answer was 290 degrees not 110 degrees

How do you work these two out?

How do you work these two out?

For the first one, Just factorise both the top and bottom, and cancel the brackets which are exactly the same at the top and bottom.

For the second one, I used the cross-multiplication method and cancelled down...I think.

For 23 (B) 4 over x+2 + 3/x-2 simplify am I the only one who got 7 over one by cancelling out everything ??

For the first question the table, was it meant to be like a tally table?

How do you work these two out?

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)

Mr M, for question 23(b)..I put:

7x-2/2x

I got the numerator correct, but the denominator wrong (I added when I should have multiplied).
So Out of 3 marks, how many would I get?



And for the '13. Hexagon and octagon'

I left this question till the final few seconds, and wrote 240-135 In the working out (Or a sum that would equal to 105)
My mind went blank because I was trying to think of the answer to this easy sum, but the exam ended and I was left with all the correct working out...but no answer. How many marks would I gain for this?

Mr M could you please remind me of the question where you have put
11. Parallelogram

39 (3 marks)
Thanks