Maths Paper 2

nyangnyang

questions 7 and 8 were impossible. Fcuked up vectors and forget cosine rule proof:(. think i got full marks in 3 and 6. overall i'd say i got a b. paper1 was way easier

Kazbah

Qu6c

i) 11 choose 4 = 330
ii) one candidate has to be picked so now you only have 10 to choose 3 from = 120
iii) Junior cycle 6 choose 2 = 15
senior cycle 5 choose 2 = 10
Junior cycle AND senior cycle = 15 X 10 = 150

iv) Junior cycle only 6 choose 4 = 15
15 of the 330 possible combinations will have only junior cycle candidates
15/33 = 1/22

dshalloo

Mark200 wrote: »

I do Higher Level and even though we're supposed to only six questions, I did NINE. I was writing until the end as you can imagine.

quote]

How did you do nine?? Cover 2 options??

i hate boards

great paper just like paper 1 but i did terribly. congrats to everyone who studied hard and did well :cool:

Censorsh!t

OL paper was great craic altogether...well ok..it was grand. Nothing off the wall came up. Very happy, should make up for my s**tty paper 1:)

Mark200

dshalloo wrote: »

Mark200 wrote: »

I do Higher Level and even though we're supposed to only six questions, I did NINE. I was writing until the end as you can imagine.

How did you do nine?? Cover 2 options??

Well we only covered Q 8 in class, but the Q9 a and b that was on our paper was actually straight forward enough just from the probablity required for the other question,

stillwater10

any idea how to do question 6 part c and question 1 (b) p2,has been wrecking my head:mad:

louise-x

I was so happy,
it was a lovely paper.
Q8 was lovely and easy, no integration by parts, which I HATE.

Blitz17

Didnt study at all... but thought i done well

As usual though, questions came up the class has never seen

Becoming a regular thing with maths

mahamageehad

HL answers...well wot i got neways, so no guarantees!!

Q1- a: (x+3)²+(y-2)²=9
bii: k= 6.5
ci: x²+y²-10x-2y+1=0
cii: grr hadnt a clu, neva learnt JC theorems!!
Q2- a: +25 -25
bi: t=4
bii: 80degrees
ci: a + kac
cii: lbd-a-c
Q3- a: 3x+7y-9=0
biii: a'=(3,0), b'=(17,-4), c'=(24,-6), d'=(8,5)
Q5- a: 7.59 cm.....i no dis is totally wrong tho!!
bi: sin4xcos2x-cos4xsin2x
bii......totally 4got how 2 do it on da day!!
Q6- a: 66%
b: 1 over root3(2+root3)n + 2over root3(2- root3)n=o
ci: 30x over x³+15x²+74x+220
cii: x=7
Q7- ai: 126
aii: 70
bi: 1 over 270,725
bii: 6084 over 270,725
biii: 468 over 270,725
c: totally blanked
Q9- a: 256 over 625
bi: 5 over 36
bii: 91 over 216
biii: WTF??!
c: between 180 and 220, i used two tailed test...was it supposed 2 b 1 tailed???

InVikingWeTrust

Censorsh!t wrote: »

OL paper was great craic altogether...well ok..it was grand. Nothing off the wall came up. Very happy, should make up for my s**tty paper 1:)

Horror show!!!

sd123

stillwater10 wrote: »

any idea how to do question 6 part c and question 1 (b) p2,has been wrecking my head:mad:

OK, 6 (c) (i)

there are (x + 5 + 1) = x + 6 total

r= red x=x w=white
scenario:
1. 1r,1x,1w (or)
2. 1r,1w,1x (or) etc.
3. 1w,1r,1x
4, 1w,1x,1r
5, 1x,1r,1w
6, 1x,1w,1r


So my theory was to find the probability of each, and add them together.
1. 5/(x+6).x/(x+5).1/(x+4) =5x/(x+6)(x+5)(x+4)
2. 5/(x+6).1/(x+5).x/(x+4) =5x/(x+6)(x+5)(x+4) When I got here, I realized that the total of each is the same for all 6. So the overall probability = 6.5x/(x+6)(x+5)(x+4) = 30x/(x+6)(x+5)(x+4), ans

now, part (ii)

all discs black x(x-1)(x-2)/(x+6)(x+5)(x+4)


let these equal, divisors cancel, 30x=x(x-1)(x-2)

x^2 - 3x + -28= 0

(x-7)(x+4)
x=7 or x=-4

Cant have -4 discs, ans = 7 (QED)


I love saying that, couldn't resist!!

I'm not gonna post it up, but for 1 (b) its in form a^2 + b^2 = r^2,

therefore, centre: (0,0) and r = \/13 (not needed)

slope r = 3/2
Perp. slope = -2/3

point (2,3) is on the line,

y-3= -2/3(x-2)

cuts x axis at y = 0
-9=-2x+4
x=(13/2)=K

axel-offbeat

Pass paper was very do-able but I stilled messed up, I'm really really bad at maths so I really hope I pass, I reckon I passed the first paper but I'm not sure about this one! Everyone came out really pleased about it and I'm really worried that I failed!

mahamageehad

sd123 wrote: »

OK, 6 (c) (i)


So my theory was to find the probability of each, and add them together.
1. 5/(x+6).x/(x+5).1/(x+4) =5x/(x+6)(x+5)(x+4)
2. 5/(x+6).1/(x+5).x/(x+4) =5x/(x+6)(x+5)(x+4) When I got here, I realized that the total of each is the same for all 6. So the overall probability = 6.5x/(x+6)(x+5)(x+4) = 30x/(x+6)(x+5)(x+4), ans

now, part (ii)
ans = 7 (QED)

I'm not gonna post it up, but for 1 (b) its in form a^2 + b^2 = r^2,

therefore, centre: (0,0) and r = \/13 (not needed)

slope r = 3/2
Perp. slope = -2/3

point (2,3) is on the line,

y-3= -2/3(x-2)

cuts x axis at y = 0
-9=-2x+4
x=(13/2)=K

u are officially my new favourite person!! i tout i messed up dat probability but got da very same as you!! can u check f ive other answers dat r rite plz?? In danger of not passing!!

~Candy~

um,
1)
a)

i)(x+3)^2 +(x-2)^2=17

b)
ii) k = 6.5

c)

icant remember , r=5??
ii) JC maths??

2

a)+/5, -5

b)-1 ii)135

C)1/3c-a ...???
ii) ??
iii)1/3 , 2/3 ( guessed)!!

3
1) what is it ??-_-

b) wooo, i ploted it!!
ii) got half of it
iii) ???
iv)???

c) lol,remembered half of it

4

a)63/65
b)i) umm, didnt work out
ii) ???-_-

C)sr= sin(angel)+1 ..???
ii) wooo, no idea..

524 cm^2
i) acos2x+sinx???
ii) 0,35,180 ( made it up)

cii) what??

8
i got 1/n = 0??
b) woooo,i got 8 ??!!-__-
c) x-x^2/2 +x^4/4!
ii) ummm,ummm...
iii) i just sub (o.2) to the thingy in part ii)..

-___- overall , depressed,like , i prob would get 40%ish..hopully,
paper 1 was away easier....but considering i am in 5th yr, i hope hope hope i will get better next yr!!!! this really isnt good:(

jessie11

sd123 wrote: »

I'm going into my local school at 3 and hopefully I'll find one just lying around so if no one scans it up, I will later!

it wil be on www.examinations.ie

stillwater10

Was the answer to Q1 (A) (X+3)^2 + (Y-2)^2=17

Katerrrs

stillwater10 wrote: »

Was the answer to Q1 (A) (X+3)^2 + (Y-2)^2=17

That's what I got anyway, pretty sure it's right!

mahamageehad

stillwater10 wrote: »

Was the answer to Q1 (A) (X+3)^2 + (Y-2)^2=17

hm i got (x+3)²+(y-2)²=9...........

Challenged

The questions and answers to Papers 2 are now up:

http://www.studentxpress.ie/papers.htm

michaelkhan3

prawn wrote: »

Did anyone do question 9? if so is part c 184<x<216? woo exempt form irish! overall not a bad paper, but i still managed to mess it up, its a talent I have

I think I got the same thing for Q9. I cant beleive people do Q8. Q9 is so much easier.

For Q9 b) iii di u use a= 1/6 and r= 25/36 ???

michaelkhan3

Mark200 wrote: »

Well we only covered Q 8 in class, but the Q9 a and b that was on our paper was actually straight forward enough just from the probablity required for the other question,

I dont Understand Why teachers only do the Calculos Option. No1 seem to do the others. I covered both Q8 and Q9 and Question 9 was probably the easiest on the paper. the only bad part was b) iii I think some people wouldnd know how to do it but Q8 c) was terible When I saw it i decided to do Q9

Mark200

michaelkhan3 wrote: »

I dont Understand Why teachers only do the Calculos Option. No1 seem to do the others. I covered both Q8 and Q9 and Question 9 was probably the easiest on the paper. the only bad part was b) iii I think some people wouldnd know how to do it but Q8 c) was terible When I saw it i decided to do Q9

Hah we didn't even cover Q9 and I think I got more in that than Q8