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# How did paper 22 0580 go?

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1. (Original post by small_genius)
i woudnt say it was hard rather these igsce ppl twisted the question and the paper became deceiving
Paper 4 2015 was very hard, paper 2 has always been the easier one so in comparisons to last years paper 2 this year was seriously hard
2. (Original post by emilyy_elizabeth)
Well I think that's one of the only questions I kind of understood. I think I got something like
a) a+b-c
b) half iof a so 1/2(a+b-c0
c) 1/2a- 1/2c+ 5/6b or something similar
I got
A) a+b-c
B) (1/2) (a+b+c)
C) -(1/2)a + (1/2)c -(1/6)b
3. (Original post by Lola_Lola)
the two radius' joined a chord so the triangle is isoceles, and we go on from there.
*Radii
4. (Original post by small_genius)
it was 2043
(log (10/7.23))/(log (1.0114)) = 28.6.....
So in 28.6... years from jan 1 2014, the population will be exactly 10 billion (according to the estimated growth rate of 1.14%).

2014+28.6..... = 2042.6...
So the population will reach 10 billion sometime during 2042.

On jan 1 2043 the population will be 10.04... billion. So it has already passed 10 billion by the time 2043 started.

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5. Was kinda shocked that it didn't include Sine Rule/Cosine or the quadratic formula....
6. PM me for any answers
7. guys what was the angles given in the circle theorem question again ?
8. I think i got 346 sides for that. it was mostly trial and error. 346-2 = 344 * 180 = 61920. and 61920 / 172 (interior angle) = 360.

(Original post by 15demon)
It was even harder than the Additional math past papers. Oh and i thought you were asking about the other angle question which was from circular measure. For polygon I couldn't come up with a solution but I think the question was an interior angle of a polygon is 173. Calculate number of sides of the polygon. Let's see if someone from TSR can help.
9. (Original post by Tunvii)
I think i got 346 sides for that. it was mostly trial and error. 346-2 = 344 * 180 = 61920. and 61920 / 172 (interior angle) = 360.
I am pretty certain that the correct answer is 45.
180(n-2)=172n
10. (Original post by Ffjhfthggt)
I am pretty certain that the correct answer is 45.
180(n-2)=172n
oops think i got that wrong then! it was a really hard test!!
11. (Original post by 15demon)
It was even harder than the Additional math past papers. Oh and i thought you were asking about the other angle question which was from circular measure. For polygon I couldn't come up with a solution but I think the question was an interior angle of a polygon is 172. Calculate number of sides of the polygon. Let's see if someone from TSR can help.
First you get the exterior angle which is 180-172=8
Then use the formula 360/8=45 sides
12. (Original post by MBamirny)
Yes, in the "beginning" of 2042 its in the 9 billion range. But no, it doesn't reach 10 billion in 2043, it reaches 10.0439... billion. Thats not 10 billion. This means that it reached 10 billion before the 1st of January 2043, which is in 2042.
ahh, alright. I guess im losing 3 marks there
13. (Original post by Abdullah IGCSE)
guys what was the angles given in the circle theorem question again ?
i think it was 62
14. (Original post by 15demon)
Was the answer to(a) 7.38 (b) 2044? :' I hated the question so much.. How did your ATP paper go if you take Bio? I skipped that matrices part ^determinant question. Didn't have time. .-.
I took bio ATP thank god they didn't descriptive questions however the experiment with the petroleum jelly thing was confusing
15. Very true
16. (Original post by shaafay)
Atleast I hope you got the quadrilateral correct. I can't believe I never thought of a parallelogram. .-.

Most people I know agree the answer to be 2043.

The expected way was apparently to use the compound interest formula. I devised my own formula and got 2043, but the devised formula was the same as the CI formulae in the end.

Well, 45 is defo correct. And I wouldn't bet on paper 4 being easier. Paper 4 is the hard paper, so better start practicing now 3:

Close. I got 68,76,78,78

78 was the mode in your variant, wasn't it?

Either way, you're not the only one. I would do past papers so effortlessly and I was finding my self at odds with the paper. Weirdly though, I found the first 5 pages the most challenging as compared to the last 6 which were a piece of cake. I always assumed it'd be the other way round. On the bright side, we might have a low threshold DD
The exact time I calculated for when the population reaches 10 billion is 3:36 PM 10th August 2042. Wouldn't that still count as in the year 2042? On 1st January 2043, the population would have already exceeded 10 billion.
17. (Original post by emilyy_elizabeth)
Well I think that's one of the only questions I kind of understood. I think I got something like
a) a+b-c
b) half iof a so 1/2(a+b-c0
c) 1/2a- 1/2c+ 5/6b or something similar
A AND B ARE CORRECT however i got something like (-2b+3c+3a)/6 for C
18. (Original post by loisclark9999)
3^n+1
3^n-1
19. (Original post by small_genius)
I took bio ATP thank god they didn't descriptive questions however the experiment with the petroleum jelly thing was confusing
Petroleum Jelly was providing a barrier stopping transpiration. On one leaf add petroleum jelly on the top surface and bottom on the other. Compare the mass change. ?
20. [QUOTE=15demon;64595099]Petroleum Jelly was providing a barrier stopping transpiration. On one leaf add petroleum jelly on the top surface and bottom on the other. Compare the mass change

Yeah it was like that but i wrote something else i hope the examiner is generous and cuts no more than two marks for that LOL

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