Junior Cert 2012: Mathematics (HL) Paper One

Bazinga_N

Mathematics (HL) Paper One
Friday, June 8th
2.00pm - 4.30pm

All discussion and questions about Mathematics (HL) Paper One goes here!

Good luck everyone!

ButtonBox

Thanks.

I am completely dreading this paper. More than any other.
So if I survive the day without breaking down, I'll be happy.

paddyzk

Algebra - serious business.

paddyzk

I like how you're the only one creating these threads Nathan :pac:

0000879k

paddyzk wrote: »

Algebra - serious business.

Algebra - easy
Now sets and indices.. *shudders* .. they're another story!

Bazinga_N

paddyzk wrote: »

I like how you're the only one creating these threads Nathan :pac:

Someone better.. Or we'd be overflown with ''QUESTION 7... WTF??'' or ''HAS ANYONE EVEN SEEN THAT TYPE OF CONSTRUCTION BEFORE?!?!?'' And I can't deal with that everytime I log on.. :L

Music4Life085

Algebraic Fractions & Long Division In Algebra

Arithmethic II - Compound Interest & Income Tax

Arithmetic I - Ratio & Percentage

Changing The Subject Of A Formula

Factors

Indices, Index Notation & Estimation

Quadratic Equations

Sets

Simultaneous Equations & Inequalities


^^ Is that all that's needed? For paper 1?

paddyzk

Music4Life085 wrote: »

Algebraic Fractions & Long Division In Algebra

Arithmethic II - Compound Interest & Income Tax

Arithmetic I - Ratio & Percentage

Changing The Subject Of A Formula

Factors

Indices, Index Notation & Estimation

Quadratic Equations

Sets

Simultaneous Equations & Inequalities


^^ Is that all that's needed? For paper 1?

Functions !

razzyy

My god i am DREADING tomorrow..

paddyzk

Think I'm the only one looking forward to it ?

DaleHyland

paddyzk wrote: »

Think I'm the only one looking forward to it ?

Maths is by far my best subject! Just a little handy tip. On all the solving questions, if you get an answer for x, sub your x value back in with your calculator to see if you're right. Works a charm for me,

I can't wait for maths! I'm so fortunate.

ButtonBox

I just get so confused when we have to build the equation.
Like all the english in it is frustrating. If they gave us the equation, I'd have no bothers. Building it, I go completely wrong and then get a crazy answer.

razzyy

DaleHyland wrote: »

paddyzk wrote: »

Think I'm the only one looking forward to it ?

Maths is by far my best subject! Just a little handy tip. On all the solving questions, if you get an answer for x, sub your x value back in with your calculator to see if you're right. Works a charm for me,

I can't wait for maths! I'm so fortunate.

What are you going over tonight for the paper? I need advice im just doing past pprs! Maths used to be my best subject by far like all a1s but then i got the worst teacher you could ever imagine

paddyzk

DaleHyland wrote: »

Maths is by far my best subject! Just a little handy tip. On all the solving questions, if you get an answer for x, sub your x value back in with your calculator to see if you're right. Works a charm for me,

I can't wait for maths! I'm so fortunate.

I do the same.

paddyzk

razzyy wrote: »

What are you going over tonight for the paper? I need advice im just doing past pprs! Maths used to be my best subject by far like all a1s but then i got the worst teacher you could ever imagine

Just doing some odd functions Qs.

if832uspx4eogt

The thought of having to do this tomorrow would freak me out.
Good luck Honours people, ye are genuines

Us Pass people will have a grand day.

razzyy

Haylee Dirty Gipsy wrote: »

The thought of having to do this tomorrow would freak me out.
Good luck Honours people, ye are genuines

Us Pass people will have a grand day.

So jealous haha

Pen Rua

I think I can manage the vast majority of the paper. I just dread Venn Diagrams so much. We've practiced a tonne of questions in class, so I feel a lot more confident compared to the Mocks...

DaleHyland

ButtonBox wrote: »

I just get so confused when we have to build the equation.
Like all the english in it is frustrating. If they gave us the equation, I'd have no bothers. Building it, I go completely wrong and then get a crazy answer.

I have a little hint, for the divisions ones.
The bigger the number at the bottom the small the number overall.

Jeanie96

Ah lads. I'm screwed.

Pen Rua

Just a little simpler than the one above me.

Bigger - Small = Difference.

200 people. x rows = 200/x.

200 people. 3 less rows. 15 extra seats = 200/x-3.

200/x-3 is bigger than 200/x. (If you get stuck, just use a number. 200/7 is 26. 200/10 is 20.)

So, bigger - smaller = difference.
200/x-3 - 200/x = 15

Get rid of fractions and you're flying.

DaleHyland

razzyy wrote: »

What are you going over tonight for the paper? I need advice im just doing past pprs! Maths used to be my best subject by far like all a1s but then i got the worst teacher you could ever imagine

I'm going over nothing, I'll just do an exam paper. I'd suggest you know functions, they are definites.

ButtonBox

DaleHyland wrote: »

I have a little hint, for the divisions ones.
The bigger the number at the bottom the small the number overall.

Ah, I'll try and remember that now tomorrow. Thank you so much!

DaleHyland

ButtonBox wrote: »

DaleHyland wrote: »

I have a little hint, for the divisions ones.
The bigger the number at the bottom the small the number overall.

Ah, I'll try and remember that now tomorrow. Thank you so much!

Anything else you need help with?

Music4Life085

EH AGH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have no idea about venn diagrams please do I really need to know them?

OwlYouNeed

I've been looking over the exam papers and I can't figure out how to do 2010 Paper 1, Question 2 part c. The marking scheme is no help to me either. I managed to get as far as 20r(25/100) but can't get past that.

Could someone explain how to do this please? Much obliged.

DaleHyland

Music4Life085 wrote: »

EH AGH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have no idea about venn diagrams please do I really need to know them?

You need to know everything, as theres a good chance it will come up. Venn diagrams always show up.

ButtonBox

Pen Rua wrote: »

Just a little simpler than the one above me.

Bigger - Small = Difference.

200 people. x rows = 200/x.

200 people. 3 less rows. 15 extra seats = 200/x-3.

200/x-3 is bigger than 200/x. (If you get stuck, just use a number. 200/7 is 26. 200/10 is 20.)

So, bigger - smaller = difference.
200/x-3 - 200/x = 15

Get rid of fractions and you're flying.

Thank you so much, the using a number thing will help loads!

ButtonBox

DaleHyland wrote: »

Anything else you need help with?

Just one question on income tax?
How do I find how much tax is payable by a person?
Please, and thank you!

graeme157

I dont know what to think about it. In the mocks I got a D1. Was one of the few in my year to pass it, never mind get a high D. I also know a lot more now because my teacher has went through everything very well. But I still have the feeling I'll forget everything, or it'll be a deadly paper. Hopefully it all goes well.

Denis Horan

Practise Algebra lads I decided to do it this evening and I realised everything went out of my head from last time I looked at it. I am sooooooooo nervous

ButtonBox

Okay, screw it.
Tried both of your good ideas and still can't do it..
Attempt marks for survival woop!

Denis Horan

All I can say is good luck guys

DaleHyland

ButtonBox wrote: »

Okay, screw it.
Tried both of your good ideas and still can't do it..
Attempt marks for survival woop!

I will not have you with attempt marks! 2011 4 c.

"Before we begin, I'll tell you the answer is 8. This is to show you how the sums work."

The new Lansdowne Road stadium has seating capacity for 200 journalists. This seating would be in x rows of equal value.

Okay. There are 200 journos. X (8) rows. If we divide the two we should get the amount of chairs per row.

Numbers of seats/Number of Rows. = Number of seats per row
200/X or 200/8 = 25.

However they decided that there will be three less rows than as normal.
Number of seats/Number of Rows = Number of seats per row
(Whether there is 100,1000,or 39403.34893109 rows the method is always the same)
200/x-3 rows or 200/8-3 = 200/5 = 40

They found 15 seats less were needed in each row.
Which is bigger x or x-3 (8 or 5) . Obviously x.
The bigger the number on the bottom, smaller overall.
200/x-3 is bigger than 200/x
200/5 is bigger than 200/8
40 is bigger than 25.

However we have to organise the x crap in such a way that the left is equal to the right, without knowing the figures.
Bigger - smaller equals difference.
Lets check
200/x - 200/x-3 =15
200/8 - 200/5 = 15
25 - 40 =15
This is wrong.
In the exam, pump any number into the calculator to see if equation is correct. It doesn't have to be the same number.
Lets check
200/x-3 - 200/x =15
200/5 - 200/8 = 15
40 - 25 =15
Ahoy, hoy! We have an equation that makes sense.
200/x - 200/x-3 =15
Unfortunetly, we have to use quadratics in the exam as we are working in xs. I hope this made it a bit clearer, My brain is a mess, not exactly a qualified teacher.

Denis Horan

graeme157 wrote: »

I dont know what to think about it. In the mocks I got a D1. Was one of the few in my year to pass it, never mind get a high D. I also know a lot more now because my teacher has went through everything very well. But I still have the feeling I'll forget everything, or it'll be a deadly paper. Hopefully it all goes well.

I got a D2 in the mock but I reckon I can get a B3 in the paper tommorrow with a generous paper

ButtonBox

Whoa, tis a very long post. Thank you so so so so so so so so so much!!

So,

(i)= 200/x

(ii)= 200/x-3 - 200/x

(iii) 200/x-3 - 200/x = 15 (and then you work it out).

Am I right?
I can't thank you enough, seriously! THANKS!

davidk11811

Can anyone give me a hand with 5a on 2009 (5b and 5c are fine) and also I haven't a clue how to do 4c on the same year, any ideas?

Anonymatronics

here is a link for algebra
/http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/

Denis Horan

Music4Life085 wrote: »

EH AGH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have no idea about venn diagrams please do I really need to know them?

I reckon you need help
2006 q2b(ii)
Add up all the no.
26x+x+18-x+20-x-2x=amount in France only
46+18-3x=amount in France only
64-3x=universal set
64-3x=70
-3x=70-64
-3x=6
x=-2

France is 18-x
so it is 18-2
ans=16

Hope this helps!!!!!

Denis Horan

Do we have to bring in our own logbooks tommorrow or are they provided does anyone know

Music4Life085

Denis Horan wrote: »

Do we have to bring in our own logbooks tommorrow or are they provided does anyone know

they have to give us , so yea they will provide just ask the examiner

Music4Life085

is anyone else really nervous I haven't studied since the mocks in feb

davidk11811

Music4Life085 wrote: »

is anyone else really nervous I haven't studied since the mocks in feb

Same

Denis Horan

Music4Life085 wrote: »

Denis Horan wrote: »

Do we have to bring in our own logbooks tommorrow or are they provided does anyone know

the have to give us , so yea they will provide just ask the examiner

Thanks a load!!!!
Did you read the solution I posted for the 2006 sets q. I put it there because a couple of people said they struggle with sets

Music4Life085

Denis Horan wrote: »

Did you read the solution I posted for the 2006 sets q. I

Only just saw it there, thanks a lot!, Any tips for the paper in general?

DaleHyland

davidk11811 wrote: »

Can anyone give me a hand with 5a on 2009 (5b and 5c are fine) and also I haven't a clue how to do 4c on the same year, any ideas?

4c
Theorem of Pythagoras = a^2 + b^2 = c^2
In this triangle (x + 1)^2 + (x+2) ^2 = (2x+2)^2

(x+1) ^2
x(x +1) +1(x+1)
x^2 + x +x + 1
x^2 + 2x +1

(x+2) ^2
x(x +2) +2 (x+2)
x^2 +2x +2x +4
x^2 +4x +4

(2x + 2 ) ^2
2x(2x +2) +2(2x+2)
4x^2 +4x +4x +4
4x^2 + 8x +4

So that leaves us with
2x^2 +6x +5 = 4x^2 +8x +4
0=2x^2 +2x -1

Part (ii)
-b +/- sqrt (b^2 -4ac) all divided by 2a.
That leaves you with x = -1.36 and 0.36

DaleHyland

5(a) The line is 5x -12
f(a) means where ever you have x sub in a
5a -12 = a (We are told the line equals a.)
4a = 12
a = 3

DaleHyland

ButtonBox wrote: »

Whoa, tis a very long post. Thank you so so so so so so so so so much!!

So,

(i)= 200/x

(ii)= 200/x-3 - 200/x

(iii) 200/x-3 - 200/x = 15 (and then you work it out).

Am I right?
I can't thank you enough, seriously! THANKS!

Yes boss! Sorry for the triple post, I felt they wouldn't make sense all together.

Denis Horan

Only just saw it there, thanks a lot!, Any tips for the paper in general?[/Quote]
Yes, watch your timing

Le Cheval

OwlYouNeed wrote: »

I've been looking over the exam papers and I can't figure out how to do 2010 Paper 1, Question 2 part c. The marking scheme is no help to me either. I managed to get as far as 20r(25/100) but can't get past that.

Could someone explain how to do this please? Much obliged.

I don't know if I'm a bit late but i hope this helps! we know that €30 interest was gained, because 25% was deducted from the interest that means €40 is the full amount. 40 divided by 2000 and multiplied by 100 will give you the value of r, I hope that made sense!

iliketwixbars

Can't wait .