Junior Cert 2010: Maths Paper 1

Namabillion · 11-06-2010 05:12PM

DKZ wrote: »

Yeah, quite a few people I spoke to found it kinda hard aswell.

Q1 C (ii) & Q2 C (i) took me ages to get but I ended up with €60,000 and 2%!

I got 35.666% for compound interest & it worked

bevan619 · 11-06-2010 05:12PM

I was the last one in the exam centre but I'm glad I stayed because I fixed my graph

I think I did well enough

giggsy664 · 11-06-2010 05:12PM

kevin12345 wrote: »

I got -1+1√7 ? I'm most likely wrong :rolleyes:

Unfortunately you are. It has to be a+-b√b
The number in the √ and just before it have to be the same

Anyone know what ye got in the Venn diagram? I got X=20

kevin12345 · 11-06-2010 05:13PM

iAmStacysMom wrote: »

x=10?

I GOT THAT TOO

and i added it all up at it totalled 100 so we are right :cool::cool::pac:

kevin12345 · 11-06-2010 05:13PM

giggsy664 wrote: »

Unfortunately you are. It has to be a+-b√b
The number in the √ and just before it have to be the same

I got 2 %

same

bevan619 · 11-06-2010 05:15PM

The petrol went up by 2.5% right?

iAmStacysMom · 11-06-2010 05:15PM

kevin12345 wrote: »

I GOT THAT TOO and i added it all up at it totalled 100 so we are right :cool::cool::pac:

Yay

*whimsical joy*

For question 3 (c)(ii) I just continued with the minus b formula. Is that really so awful?

kevin12345 · 11-06-2010 05:15PM

bevan619 wrote: »

The petrol went up by 2.5% right?

I think so

can't really remember that q

Closed ac · 11-06-2010 05:16PM

Namabillion wrote: »

I got 35.666% for compound interest & it worked

Other people I spoke to after the exam got 2% aswell.

€2030 - €2000 = €30
€30 = 75%
€40 = 100%

€40/€2000 x 100% = 2%

giggsy664 · 11-06-2010 05:16PM

bevan619 wrote: »

The petrol went up by 2.5% right?

1.20 -> 1.17

3/120 *100/1 = 2.5% Yeah

iAmStacysMom · 11-06-2010 05:16PM

bevan619 wrote: »

The petrol went up by 2.5% right?

That's what I got

DylanS09 · 11-06-2010 05:18PM

I feel like some tard now!ha
I didn't get any of the answers ye're calling out!

suitcasepink · 11-06-2010 05:18PM

giggsy664 wrote: »

1.20 -> 1.17

3/120 *100/1 = 2.5% Yeah

I got one thing right atleast...

Colm! · 11-06-2010 05:18PM

Mayoegian wrote: »

Well what was the value of b? Are you sure that B was positive? It could have been negative, so when you put it into the formula it would turn positive?

EDIT: I got 2.5% for petrol and 2% for compound interest (increasing to €2060.45 for second year)
EDIT2: Yup, I got €60,000 for the income question too

Luno · 11-06-2010 05:20PM

DylanS09 wrote: »

I feel like some tard now!ha
I didn't get any of the answers ye're calling out!

Same! I thought I done good and all!

mista_2k10 · 11-06-2010 05:21PM

I definity done bad in that paper

DylanS09 · 11-06-2010 05:23PM

M&S* wrote: »

Same! I thought I done good and all!

It's ok Mary...
We'll show them all when Paper Two comes 'round...well not really, but still!

Closed ac · 11-06-2010 05:23PM

Does anyone know how to do the question:

Solve f(x) = f(x+1) ?

Mayoegian · 11-06-2010 05:24PM

DKZ wrote: »

Does anyone know how to do the question:

Solve f(x) = f(x+1) ?

Are you sure that was the full question? Was there any other details included in the Q?

Namabillion · 11-06-2010 05:25PM

DKZ wrote: »

Other people I spoke to after the exam got 2% aswell.

€2030 - €2000 = €30
€30 = 75%
€40 = 100%

€40/€2000 x 100% = 2%

€2000 + r% = 2706.66 -25% = 2030

2030 = 75 %
2806.66 = 100%

use compound formula F= P(1+ t r
2706.66 = 2000r
divide by 2000
1.3533333 Which is 35.333%

Colm! · 11-06-2010 05:25PM

Yeah DKZ, I did that. Let's just say the function was f:x -> x²+x+1, what you'd write is:
x²+x+1 = (x+1)²+(x+1)+1

There's two X values at the end because that's a quadratic equation. When the papers go up I'll do a step-by-step because I don't know the exact figures

giggsy664 · 11-06-2010 05:26PM

DKZ wrote: »

Does anyone know how to do the question:

Solve f(x) = f(x+1) ?

You sub in (x+1) for (x). I got something like x = -2/5

Luno · 11-06-2010 05:26PM

DylanS09 wrote: »

It's ok Mary...
We'll show them all when Paper Two comes 'round...well not really, but still!

Sh we will!

Me and Dylan had a sort of applied maths paper you see that's why the answers are different!

Ally7 · 11-06-2010 05:27PM

Namabillion wrote: »

€2000 + r% = 2706.66 -25% = 2030

2030 = 75 %
2806.66 = 100%

use compound formula F= P(1+ t r
2706.66 = 2000r
divide by 2000
1.3533333 Which is 35.333%

But wasn't the tax on the interest, nt the actual amount itself?

Closed ac · 11-06-2010 05:27PM

Mayoegian wrote: »

Are you sure that was the full question? Was there any other details included in the Q?

Oh, yeah woops. I left out the equation:

f:x -> x squared - 4x + 5

mista_2k10 · 11-06-2010 05:27PM

Colm! wrote: »

Yeah DKZ, I did that. Let's just say the function was f:x -> x²+x+1, what you'd write is:
x²+x+1 = (x+1)²+(x+1)+1

There's two X values at the end because that's a quadratic equation. When the papers go up I'll do a step-by-step because I don't know the exact figures

can i buy your brain?!!:pac::o

Closed ac · 11-06-2010 05:28PM

Ally7 wrote: »

But wasn't the tax on the interest, nt the actual amount itself?

Yeah it was a tax on the interest earned.

Colm! · 11-06-2010 05:31PM

OK, it's not a quadratic, sorry.

x²-4x+5 = (x+1)²-4(x+1)+5
x²-4x+5 = x²+2x+1-4x-4+5
x²-4x+5 = x²-2x+2
-6x+6 = 0
-6x = -6
x = 1

EDIT2: WRONG WRONG WRONG, This is an incorrect answer, it's actually -x squared, not x squared.
EDIT: Waaait that's not what I got in the exam. Either these aren't the right figues, or I ****ed up.

bevan619 · 11-06-2010 05:31PM

I did the graph good :cool:

kevin12345 · 11-06-2010 05:32PM

bevan619 wrote: »

I did the graph good :cool:

what did you get for the C) parts for the graph?

Junior Cert 2010: Maths Paper 1

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