Carrotsticks' MX2 HSC 2013 Solutions (2 Viewers)

[RealiseNothing]

Carrot, another one:

question 14div) (the radius one) there's a wee error.
http://latex.codecogs.com/gif.latex...r^2 \\20r^2 = 189 \\r = \sqrt{\frac{189}{20}}
must be the Red Bull

The answer he has is correct.

Maybe?

 

[seanieg89]

Carrot, another one:

question 14div) (the radius one) there's a wee error.
http://latex.codecogs.com/gif.latex...r^2 \\20r^2 = 189 \\r = \sqrt{\frac{189}{20}}
must be the Red Bull

Yeah its sqrt(189/20).

 

[RealiseNothing]

With that 10 marker and the induction and circle geo, I would say 100 would be super hard to get.

The circle geo and induction were pretty easy compared to the rest of the paper in my opinion. The induction took 3 lines.

 

[RealiseNothing]

Yeah its sqrt(189/20).

really? I got the same answer doing it a different way...

 

[Carrotsticks]

Carrot, another one:

question 14div) (the radius one) there's a wee error.
http://latex.codecogs.com/gif.latex...r^2 \\20r^2 = 189 \\r = \sqrt{\frac{189}{20}}
must be the Red Bull

Isn't that the same thing haha. Rationalise denominator etc?

 

[kewon]

yeah obviously hard to get but i think would be very achievable for the top 20 (maybe more) individuals in the state
i know a kid who only dropped 3 marks and hes ranked 10th in his school

 

[MATHmaster]

What would a 78 align to?

 

[seanieg89]

really? I got the same answer doing it a different way...

I will look over my work again, but I got sqrt(189/20) using my own method which was pretty different too.

 

[RealiseNothing]

I think a lot of these supposed 100 getters will lose a couple subtle marks. The marking isn't so straight forward.

 

[RivalryofTroll]

Thanks Carrot <3

[Using your solutions, I think my mark is around 62-64 - I originally thought 58-62 so yay!]

 

[Lanxal]

My solution was , yeah, using Carrot's method.

 

[bangladesh]

What is everyone thinking of the e4 cutoff? It won't be higher than like 68.. will it?
*waits nervously*

 

[bottleofyarn]

Isn't that the same thing haha. Rationalise denominator etc?

I'm a dingus, absolutely correct. Wish I got it in the test though haha.

 

[RealiseNothing]

I will look over my work again, but I got sqrt(189/20) using my own method which was pretty different too.

I made a triangle using the perpendicular bisector of CD, the radius OD, and half of CD. Then just a bit of trig.

I'm curious what was your approach?

 

[SpiralFlex]

What is everyone thinking of the e4 cutoff? It won't be higher than like 68.. will it?
*waits nervously*

The cut off for band 6 when the marking was out of 120 was 76ish. So a 68 should definitely net you a band 6.

 

[Carrotsticks]

I'm a dingus, absolutely correct. Wish I got it in the test though haha.

I'm a 'dingus' too.

Spent 1 hour on a Cosine rule question because I could not do the following:

1. Use the cosine rule correctly.

2. Use SOH CAH TOA.

 

[bangladesh]

The cut off for band 6 when the marking was out of 120 was 76ish. So a 68 should definitely net you a band 6.

Thank you. Let's hope so

 

[RealiseNothing]

Who wants to join my "lost more marks in question 11 than in question 16" crew?

Spewin' really

 

[Currybear]

well im fucked

 

[Web Addict]

Who wants to join my "lost more marks in question 11 than in question 16" crew?

Spewin' really

Me. I forgot about the borders in the integration in Question 11. I'm so pissed at myself.