Maths HL P1 & 2 2017

daraghwal · 09-06-2017 05:31PM

https://www.examinations.ie/tmp/1497029290_3232988.pdf

Could someone do out 4 (a) to put my mind at ease? Also what did people get for a and b on question 6 and what did people get for the end of question 9 (c)

I know post mortems aren't good but it's just to put my mind at ease. Thanks in advance!

I think I got 10 for 4 (a) for some reason

Nyctolust · 09-06-2017 05:33PM

I swore to myself I wouldn't leave anything blank but the last two questions were barely even started (couldn't even get the table in the financial maths question to work out) and I did end up leaving some other blanks. Couldn't get a single bit of the amortisation proof either because I don't even remember doing it in class at any point. I'm really bloody frustrated with myself because I was counting on getting an okay mark in P1 since I normally find P2 much harder, and I could tell this paper wasn't even bad, I'm just really stupid.

Haven't even decided which Irish essays to learn this weekend. Gah

Telo123 · 09-06-2017 05:34PM

Anyone get like 32 euro for the weekly repayment amount?

daraghwal · 09-06-2017 05:36PM

Telo123 wrote: »

Anyone get like 32 euro for the weekly repayment amount?

Got something like that. Could be 36 but definitely in the 30s.

hasdanta · 09-06-2017 05:36PM

Telo123 wrote: »

Anyone get like 32 euro for the weekly repayment amount?

I think I got like €31.16 or something along does lines

Manufan123 · 09-06-2017 05:37PM

daraghwal wrote: »

Got something like that. Could be 36 but definitely in the 30s.

36 sounds familiar

carefulnowted · 09-06-2017 05:40PM

I got €33 point something. I think varying answers there could be attributed to rounding/not rounding the interest rate, so hopefully we won't lose many marks.

tibetan452309 · 09-06-2017 05:55PM

carefulnowted wrote: »

I got €33 point something. I think varying answers there could be attributed to rounding/not rounding the interest rate, so hopefully we won't lose many marks.

Got that as well. Normally they don't deduct marks for rounding off/not rounding off unless they specified.

Did you get 66 months for the amortisation one?

carefulnowted · 09-06-2017 06:06PM

Yep. I don't think Q8 went too badly for me, but Q9 and Q7 were another story. I couldn't figure out when the populations would be the same at all.

jogd1234 · 09-06-2017 06:08PM

daraghwal wrote: »

https://www.examinations.ie/tmp/1497029290_3232988.pdf

Could someone do out 4 (a) to put my mind at ease? Also what did people get for a and b on question 6 and what did people get for the end of question 9 (c)

I know post mortems aren't good but it's just to put my mind at ease. Thanks in advance!

I think I got 10 for 4 (a) for some reason

For 4(a) I got 13, the answer is 12.47 or something but rounds up. Use tn=ar*n-1 with r= 0.45.

For 6(b) I got something like 0.4968 I think.

For 9(c) I think I got 13:26 and 15:42, my method wasn't very mathsy but I think those are the answers.

thetalker · 09-06-2017 06:26PM

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

One more thing, I didn't realize |w| was the radius and wasted that Q. arrrgh.

Hope I ace p2 otherwise I'm screwed.

ciara18 · 09-06-2017 06:30PM

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

One more thing, I didn't realize |w| was the radius and wasted that Q. arrrgh.

Hope I ace p2 otherwise I'm screwed.

The interest was from remaining lump sum left over each time, not the €125!

VG31 · 09-06-2017 06:31PM

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.

I didn't even know that proof existed. I thought all the proofs were on Paper 2.

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

I got €125 as well. Did anyone else get that? It seemed like a simple question at the start but it was actually really confusing.

How were you supposed to get a and b in Q9? I had absolutely no idea.

Telo123 · 09-06-2017 06:32PM

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

One more thing, I didn't realize |w| was the radius and wasted that Q. arrrgh.

Hope I ace p2 otherwise I'm screwed.

I thought it was the modulus of the complex number

blueee · 09-06-2017 06:36PM

Telo123 wrote: »

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

One more thing, I didn't realize |w| was the radius and wasted that Q. arrrgh.

Hope I ace p2 otherwise I'm screwed.

I thought it was the modulus of the complex number

Yeah, I thought that was the modulus too!?

thetalker · 09-06-2017 06:36PM

ciara18 wrote: »

The interest was from remaining lump sum left over each time, not the €125!

Fuuuuuu-

How are we supposed to know that. Arrrgh

Edit: I see it now, I just wish I had before...

Monaghan_98 · 09-06-2017 06:36PM

Telo123 wrote: »

I thought it was the modulus of the complex number

I think that |w| means the modulus! What did you get for t in that answer?

thetalker · 09-06-2017 06:40PM

blueee wrote: »

Yeah, I thought that was the modulus too!?

Same thing, I took it literally as in

|r(cos30°+isin30°)| equals 3
So then {r(cos30+isin30)}^2 equals 3^2

You can see how wrong that is though

If you did r equals 3 for w that's right

Which means
w = 3(cos30+isin30)

carefulnowted · 09-06-2017 06:42PM

I got t = -6 + 0i

wanderer100 · 09-06-2017 06:43PM

carefulnowted wrote: »

I got t = -6 + 0i

I got t = +6 +0i

tibetan452309 · 09-06-2017 06:50PM

thetalker wrote: »

So angry about the amortisation proof, had no clue what do do.
Also what was up with that financial table, I got €125 euro as the monthly payment so how on earth is 41 euro the interest to pay??
Am I just being stupid or something.
Also that tide q was a nightmare.

One more thing, I didn't realize |w| was the radius and wasted that Q. arrrgh.

Hope I ace p2 otherwise I'm screwed.

What do you mean by radius? Didn't see any circles on the paper

Monaghan_98 · 09-06-2017 06:51PM

wanderer100 wrote: »

I got t = +6 +0i

Ah thank god, that's some small relief from a challenging paper tbh

tibetan452309 · 09-06-2017 06:51PM

wanderer100 wrote: »

I got t = +6 +0i

Woo same

thetalker · 09-06-2017 06:52PM

tibetan452309 wrote: »

What do you mean by radius? Didn't see any circles on the paper

The modulus of a complex number is referred to as a r in the polar form, so I usually call it the radius.
I wasn't familiar with the way it's denoted as |w|

tibetan452309 · 09-06-2017 06:55PM

thetalker wrote: »

The modulus of a complex number is referred to as a r in the polar form, so I usually call it the radius.
I wasn't familiar with the way it's denoted as |w|

Ah ok. Calling it the radius makes sense now that I think of it since it's the distance from the origin to the number

Liordi · 09-06-2017 07:07PM

Some of the questions on that paper really threw me. Got most of Q8 and 9 wrong.
How were we supposed to do these?

&

thetalker · 09-06-2017 07:22PM

Liordi wrote: »

Some of the questions on that paper really threw me. Got most of Q8 and 9 wrong.
How were we supposed to find the range of values for a and the question like f(g)(X)

idk about the range but the f(g(x)) means that one function is insdie another

eg f(x)=2x
and g(x)= x+5

so f(g(x)) is 2(x+5)

Liordi · 09-06-2017 07:25PM

thetalker wrote: »

idk about the range but the f(g(x)) means that one function is insdie another

eg f(x)=2x
and g(x)= x+5

so f(g(x)) is 2(x+5)

Oh, I was completely lost. I just got the derivative of both of them and didn't really know what to do.

I've only ever seen it wrote like this f ∘ g

thetalker · 09-06-2017 07:29PM

Liordi wrote: »

Oh, I was completely lost. I just got the derivative of both of them and didn't really know what to do.

I've only ever seen it wrote like this f ∘ g

For me it was the opposite, I had never seen it written with the circle dot until a few days ago.

Anyway for p2, will that just be probability, constructions, circles and trig?

I dont wanna end up in a situation like this paper where there's some easy marks I lose out on cause I don't get the terminology or didn't read up before.

wanderer100 · 09-06-2017 07:47PM

Feels like the SEC are trying to mix up what comes up on P1 and P2. Wasn't a lot of algebra on that P1 so wouldn't be surprised to see it on P2. I'm sure most people won't be expecting another trig question after that long one. Not sure if its worth another study

Maths HL P1 & 2 2017

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