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Edexcel IGCSE Math Higher Tier 4H 9 June 2016 Unofficial Mark scheme

here are the answers I have for the 4H paper from this morning, add corrections if need be and missing answers that i missed out!

1. 3n+4

2. 5.4

3. a) 388
b) 395

4. a) 63
b) 50
c) 41

5. a) m⁷
b) c⁸
c) a¹⁵

6. 456

7. Graph question.. missing values in table
-7, -1, 2, 7

8. a) Enlargment scale Factor = 2 centre of enlargement = (1,0)
b) co ordinates (7,-2) (10,-2) (7,-1)
c) co ordinated of rotated shape (2,0) (2,3) (1,3)

9. 135

10. 60

11. a) 97000000
b) 1.4 x 10⁸
c) 1.08 x 10⁹
d) 11

12. a) 5.2
b) 5

13. a) M = 0.25p
b) 31.25

14. (x+5)/(2x+1)

15. a) 8x-1
b) 2a³e²

16.

17. a)
b)
c)
d) x=1, x=4

18.

19. -5+12 root 18

20.

21.

22. a) MN =
b) PR = q - 1/2p
c) OP = 2QR so both are parallel lines

Im quite new to this so I'm not so sure how to the whole spoiler thing and whatever there normally is on other markschemes. Sorry in advance for any mistakes made. Please help complete the mark scheme :smile:

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Reply 1

meee1233

Hey! thanks for the answers, just wondering how for number 1 it was 3n+4. I thought the number sequence went 17-->19-->21? I put n+3? Maybe I was overlooking some important factor?

Reply 2

Milena1810

Hey. Do people actually have the paper as I am finding it hard to see how many marks I got as I forgot the Q's Lol. Soz to be a pain! :-)

Reply 3

meg36

From what I remember the first 3 terms were 7, 10, 13 so 3n+4 fits the sequence.

Reply 4

meee1233

Original post by meg36

From what I remember the first 3 terms were 7, 10, 13 so 3n+4 fits the sequence.

Okay thanks but do you mind explaining if it won't take too long? Isn't 7 to 10 just plus three, like 10 to 13?

Reply 5

meee1233

Original post by Milena1810

Hey. Do people actually have the paper as I am finding it hard to see how many marks I got as I forgot the Q's Lol. Soz to be a pain! :-)

Yes this would be helpful, I agree

Reply 6

LotusLotus

Original post by meee1233

Okay thanks but do you mind explaining if it won't take too long? Isn't 7 to 10 just plus three, like 10 to 13?

To find the nth term, you want to find the common difference (In this case it was 3), and put it by n.
So what we know at this point is that it starts 3n. To make this correct and relevant to what we are given, which was 7, 10, 13, ... you want to subtract the difference on the first term. So 3n+4 because 7-3 = 4.
To check, simply solve to find what the first term would equal, so 3(1) + 4 = 7, or even to check further, using the second term 3(2) + 4 =10.

Reply 7

meee1233

okay thankyou! I had no idea ughh. Thanks.

Reply 8

User5678

For question 16,the probability,I got 3/95 for a and 9/38 for b

Reply 9

ED5727221

1. 3n+4

2. y = 5.4

3. a) 388
b) 395

4. a) 63
b) 50
c) 41

5. a) m⁷
b) c⁸
c) a¹⁵
d) 10x + 22

6. 456

7. Graph question.. missing values in table
-7, -1, 2, 7

8. a) Enlargment scale Factor = 2 centre of enlargement = (1,0)
b) co ordinates (7,-2) (10,-2) (7,-1)
c) co ordinated of rotated shape (2,0) (2,3) (1,3)

9. 135

10. x = 60

11. a) 97000000
b) 1.4 x 10⁸
c) 1.08 x 10⁹
d) k = 11

12. a) 5.2
b) 5

13. a) M = 0.25p^3
b) 31.25

14. (x+5)/(2x+1)

15. a) 8x-1/15
b) 2a³e²

16.*tree diagram*
b)3/95
c ) 9/38

17. a) 3
b) 7
c) (x+5)/2
d) x=1, x=4

18 a) 15
b) *fill in histogram with class width 15 (or something like that) and frequency density 0.48*

19. -5+12 root 18

20.

21a) *Venn Diagram number inside were 4,4,6 6,5,2 ,3 2*
b) 5/9

22. a) MN = -4p +2q
b) PR = q - 1/2p
c) 2OP = QR so both are parallel lines

- Filled in all the rest... except 20... i forgot what i put

(edited 7 years ago)

Reply 10

User5678

You didn't forget it,the question was to show how you got (300+100root2)*pi,so there was no real answer,but instead the method you used

Reply 11

Went01

Original post by meee1233

Hey! thanks for the answers, just wondering how for number 1 it was 3n+4. I thought the number sequence went 17-->19-->21? I put n+3? Maybe I was overlooking some important factor?

Hi,the sequence started 7,10,13,16,19 so the difference between each sequence is 3 therefore the nth term will be 3n, but this isn't all. Because the first term n is always=1 then we need to add 4 to make it 7.
3(1)+4=7
3(2)+4=10
3(3)+4=13
etc...

Reply 12

Milena1810

Has anyone actually got a copy of the paper?

Reply 13

Agrace_15

was the probability q without replacement?? if it is I'm so done for, will they do error carried forward for the next one if i used my wrong probabilities?

Reply 14

User5678

ECF are very rarely given,but you may score some method marks!

Reply 15

Milena1810

Does anyone know where I can get a copy of the paper from?

Reply 16

Betty1234567890

Would I be able to do igcse maths repeat in November? I messed up and I was actually confident. Now that I look back i knew the answer for every single question. If i repeat my maths GCSE does that mean my previous one is cancelled? }

Reply 17

KIRAN333

Anyone have a clue what the grade boundaries will be like for both the IGCSE Maths papers?

88 for A star

Can anyone please tell me if I would be able to do igcse maths repeat again. I messed up and the fact that I actually revised and knew everything is killing me inside. I would just like to do it again. Another question if I'm redoing the igcse does that mean my past grade form this current gcse is cancelled?