Mathematics Extension 1 HSC thoughts (2 Viewers)

[Vall]

guys was this the answer to 14)a)?View attachment 36769

pretty sure / i hope so
that's what I got

 

[yanujw]

guys was this the answer to 14)a)?View attachment 36769

Yep that's correct

 

[JohnGee123]

anyone else get 16d as 358

Yes I did. I now have hope!

 

[Life'sHard]

Lol nesa really loving those physics questions this year.

 

[Life'sHard]

Overall looks like a very solid paper.

 

[ExtremelyBoredUser]

Predicted e4 cutoff? Thinking same as last year since difficulty only increased by a bit

 

[ExtremelyBoredUser]

Regardless if you fkd up or not, I'm pretty sure everyone here is getting a guaranteed E4, no way you're getting less than 70% raw

 

[Trebla]

Interesting there are two normal approximation questions (and two induction questions for Ext2) when they usually only appear once. This paper is also very overweighted on vector questions lol

 

[Anaya R]

Looking at that paper... lot of probability. Interesting.
Also lot of functions stuff.

 

[notme123]

wow that was absurdly hard

the last question was similar to last year 14c. i got 358 tickets max which some other people have said so very well done to them if were correct

 

[xdk1ng]

Yeah I got D as well, if you just spam in progressively increasing values of y the gradient results in constantly positive values and D was the only one that exhibited something like that

but from this, the answer was C right, with horizontal asymtote?
geogebra.org/m/W7dAdgqc

 

[aim for 95+]

This paper is good overall, By the way, do you guys have any chemical trial paper?

 

[tgone]

So a person who got 67 will only be 9 marks off a person that’s got 97? Doesn’t seem very fair to high achievers

I think the way UAC calculates atar from the HSC marks makes it slightly more fair, not sure though

 

[Vall]

I think the way UAC calculates atar from the HSC marks makes it slightly more fair, not sure though

Yea, once scaling gets applied the person whose HSC mark ended up being 100 instead of 90 gets a significantly higher aggregate (which contributes to ATAR)
Pretty sure UAC doesn’t even look at the HSC aligned mark, they only look at the raw marks

 

[ExtremelyBoredUser]

Adobe Acrobat

acrobat.adobe.com

Solutions, no guarantee theyre correct

Note 13ei) is a bit wrong because didn't have z score table
Other parts could be wrong

About q9, I felt (A) was the right answer but I heard my friends arguing it was (D), could you consider why?

 

[tgone]

Yea, once scaling gets applied the person whose HSC mark ended up being 100 instead of 90 gets a significantly higher aggregate (which contributes to ATAR)
Pretty sure UAC doesn’t even look at the HSC aligned mark, they only look at the raw marks

I think UAC uses only the HSC aligned mark and then scales that based on their own thing, which is skewed non-linearly from the very high marks (which is what adjusts it so that a student who gets 98-->100 is rewarded over the 67-->90), which is what counts to your aggregrate:

I'm not sure nesa even gives UAC the raw marks? Not sure of this though, don't quote me on that

 

[notme123]

About q9, I felt (A) was the right answer but I heard my friends arguing it was (D), could you consider why?

oh you know what. D is correct

consider f(x) = 1/x
f-1(x) is 1/x
they intersect everywhere, not only on y=x

answer is D

thanks for that ill change it and upload new ones later

 

[tgone]

About q9, I felt (A) was the right answer but I heard my friends arguing it was (D), could you consider why?

consider the example y=-x^3

inverse function is y=(-x)^1/3

They intersect at three places, but only one of them is along y=x.

 

[ExtremelyBoredUser]

consider the example y=-x^3

inverse function is y=(-x)^1/3

They intersect at three places, but only one of them is along y=x.

Ah shit yea that makes sense

 

[tgone]

oh you know what. D is correct

consider f(x) = 1/x
f-1(x) is 1/x
they intersect everywhere, not only on y=x

answer is D

thanks for that ill change it and upload new ones later

this example is not correct, see the one i posted before:

the question specified both the functions were differentiable and real across all x and y, which hyperbolas are not.