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# Edexcel 9-1 GCSE Maths (Higher) - 2017 Paper 1 - UNOFFICIAL MARK SCHEME watch

1. If you're looking for foundation then go here: https://www.thestudentroom.co.uk/sho...6#post71772886

1. (a) (10,19) (1 mark)

(b) Positive correlation (1 mark)

(c) Estimated number of hours sunshine 12.8 (2 marks)

(d) Yes the weatherman is correct because as the hours of sunlight increases the temperature increases (1 mark)

2. 56 as prime factors = (2 marks)

3. (3 marks)

4. prove that
- diagram:

Spoiler:
Show

(3 marks)

5. 70.5kg of metal
solution -

Spoiler:
Show

(5 marks)

6. Show that and are parallel
solution -
Spoiler:
Show

(2 marks)

7. boys mean mark = 72 (3 marks)

8. (a) write as a normal number: 0.00000797 (1 mark)

(b) work out (2 marks)

9. take off tax: £500 (2 marks)

10. expand (3 marks)

11. (a) Turning point of graph = (1, -3) (1 mark)

(b) estimates for roots: -0.7 and 2.75 (1 mark)

(c) estimate for (1 mark)

12. (a) (2 marks)

(b) (2 marks)

13. (a) find equation for (2 marks)

(b) find positive value of when (2 marks)

14. Find fraction of shapes that are circles: (4 marks)

15. (a) estimate height of cone: 4cm (3 marks)

(b) h is a overestimate (1 mark)

16. Prove that is even
solution -
Spoiler:
Show

(4 marks)

17. probability of picking two different coloured counters = or equivalent (4 marks)

18. find equation of line in rhombus: (4 marks)

19. vectors question:

(4 marks)

20. and (5 marks)

21. prove that diagonals are equal: use congruent triangles (4 marks)
Diagram for question 21:
Spoiler:
Show

22. prove that

Diagram for question 22:
Spoiler:
Show

(5 marks)

2. Does anyone have a copy of the paper they can send me please?
3. Haha I'm ****ed
4. Express 56 as it's prime factors, can't remember what question number it was but the answer is 2^3 x 7
5. Omg I think I actually did really well.
6. (Original post by hebeb)
1. (i) (11,19)
(ii) positive correlation
(iii) yes the weatherman is correct because as the hours of sunlight increases the temperature increases
2. turning point = (1, -3)
approximate roots = -0.7, 2.75

f(1.5) = -2.4
3. prove that x^2+6x=1
4. 70.5kg of metal
5. write down the value of 81^(1/2): 1/9
work out (64/125)^(2/3): 16/25
6. expand (x+1)(x+2)(x+3): x^3+6x^2+11x+6
7. (i) write 7.63x10^-6 in standard form: 0.00000763
work out 2.62x10^5/4x10^-3: 6.3x10^8
8. take off tax: £500.
9. (i) y=9/x^2
(ii) work out positive value of x when y=16: x=3/4
10. fraction of circles = 1/3
11. (i) h=4
(ii) estimate is greater than true value
12. prove that n^2-2-(n-2)^2 is even
13. prove that lines are parallel: have same gradient
14. probability of picking two different coloured counters = 7/18 or equivalent
15. find equation of line in rhombus: y=-2x+21
16. find average mark of boys in class: 72
17.
18.
19. vectors question: k = 2/5
20. x=-24/5, y = -7/5 and x = -3, y = 4
21. prove that diagonals are equal: use congruent triangles
Diagram for question 21:
22. prove that cos PBQ = 1-((2-root3)/200)x^2

Express 56 as a product of its prime factors: 2^3*7 (don't know which question this was)

Hi did you get all of these answers in the exam
7. (Original post by hebeb)
1. (i) (11,19)
(ii) positive correlation
(iii) yes the weatherman is correct because as the hours of sunlight increases the temperature increases
2. turning point = (1, -3)
approximate roots = -0.7, 2.75
f(1.5) = -2.4
3. prove that x^2+6x=1
4. 70.5kg of metal
5. write down the value of 81^(1/2): 1/9
work out (64/125)^(2/3): 16/25
6. expand (x+1)(x+2)(x+3): x^3+6x^2+11x+6
7. (i) write 7.63x10^-6 in standard form: 0.00000763
work out 2.62x10^5/4x10^-3: 6.3x10^8
8. take off tax: £500.
9. (i) y=9/x^2
(ii) work out positive value of x when y=16: x=3/4
10. fraction of circles = 1/3
11. (i) h=4
(ii) estimate is greater than true value
12. prove that n^2-2-(n-2)^2 is even
13. prove that lines are parallel: have same gradient
14. probability of picking two different coloured counters = 7/18 or equivalent
15. find equation of line in rhombus: y=-2x+21
16. find average mark of boys in class: 72
17.
18.
19. vectors question: k = 2/5
20. x=-24/5, y = -7/5 and x = -3, y = 4
21. prove that diagonals are equal: use congruent triangles
Diagram for question 21:
22. prove that cos PBQ = 1-((2-root3)/200)x^2

Express 56 as a product of its prime factors: 2^3*7 (don't know which question this was)

For question 2, the scale on the Y axis was different to the one on the X axis. Thus, f(1.5) was -2.8. There were only 5 squares in 1 difference in y.
8. does anyone know how many marks question 15 was worth overall? completely stuffed that one - i got 100/125 or something like that and wrote that my answer was an underestimate
9. What was the fraction of circles question, i forgot or missed it :/
10. For Q14 I got 1/2

2/9 x 7/8 = 14/56
7/9 x 2/8 = 14/56
Together = 28/56 = 1/2

edit: ignore this
11. (Original post by hebeb)
1. (i) (11,19)
(ii) positive correlation
(iii) yes the weatherman is correct because as the hours of sunlight increases the temperature increases
2. turning point = (1, -3)
approximate roots = -0.7, 2.75
f(1.5) = -2.4
3. prove that x^2+6x=1
4. 70.5kg of metal
5. write down the value of 81^(1/2): 1/9
work out (64/125)^(2/3): 16/25
6. expand (x+1)(x+2)(x+3): x^3+6x^2+11x+6
7. (i) write 7.63x10^-6 in standard form: 0.00000763
work out 2.62x10^5/4x10^-3: 6.3x10^8
8. take off tax: £500.
9. (i) y=9/x^2
(ii) work out positive value of x when y=16: x=3/4
10. fraction of circles = 1/3
11. (i) h=4
(ii) estimate is greater than true value
12. prove that n^2-2-(n-2)^2 is even
13. prove that lines are parallel: have same gradient
14. probability of picking two different coloured counters = 7/18 or equivalent
15. find equation of line in rhombus: y=-2x+21
16. find average mark of boys in class: 72
17.
18.
19. vectors question: k = 2/5
20. x=-24/5, y = -7/5 and x = -3, y = 4
21. prove that diagonals are equal: use congruent triangles
Diagram for question 21:
22. prove that cos PBQ = 1-((2-root3)/200)x^2

Express 56 as a product of its prime factors: 2^3*7 (don't know which question this was)

Product of prime is question 2
12. (Original post by reemer9997)
For question 2, the scale on the Y axis was different to the one on the X axis. Thus, f(1.5) was -2.8. There were only 5 squares in 1 difference in y.
Yeah just couldn't remember the value cheers
13. there was a multiplication question in the paper right?
14. (Original post by Malph)
For Q14 I got 1/2

2/9 x 7/8 = 14/56
7/9 x 2/8 = 14/56
Together = 28/56 = 1/2
9*8 isn't 56, it's 72
15. Does anyone know how much each question was worth (for marks), so we can predict what scores we have got?
16. (Original post by Ahmed257)
there was a multiplication question in the paper right?
I got 234.78, can't remember the question
17. (Original post by ZainahS)
9*8 isn't 56, it's 72
im an idiot xD
18. (Original post by hebeb)
1. (i) (11,19)
(ii) positive correlation
(iii) yes the weatherman is correct because as the hours of sunlight increases the temperature increases
2. turning point = (1, -3)
approximate roots = -0.7, 2.75
f(1.5) = -2.8
3. prove that x^2+6x=1
4. 70.5kg of metal
5. write down the value of 81^(1/2): 1/9
work out (64/125)^(2/3): 16/25
6. expand (x+1)(x+2)(x+3): x^3+6x^2+11x+6
7. (i) write 7.63x10^-6 in standard form: 0.00000763
work out 2.62x10^5/4x10^-3: 6.3x10^8
8. take off tax: £500.
9. (i) y=9/x^2
(ii) work out positive value of x when y=16: x=3/4
10. fraction of circles = 1/3
11. (i) h=4
(ii) estimate is greater than true value
12. prove that n^2-2-(n-2)^2 is even
13. prove that lines are parallel: have same gradient
14. probability of picking two different coloured counters = 7/18 or equivalent
15. find equation of line in rhombus: y=-2x+21
16. find average mark of boys in class: 72
17.
18.
19. vectors question: k = 2/5
20. x=-24/5, y = -7/5 and x = -3, y = 4
21. prove that diagonals are equal: use congruent triangles
Diagram for question 21:
22. prove that cos PBQ = 1-((2-root3)/200)x^2

Express 56 as a product of its prime factors: 2^3*7 (don't know which question this was)

Question 1 is 10,19
19. I think I got around 72 in the paper
20. Anyone know the fraction of circles question ppl on about

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