Discussion and Suggested Solutions - Mathematics 2017

[sajochi]

Surprisingly, i was able to do the geometry questions of question 16 but struggled so much with the last two parts of the bicycle question. Somehow i got x=90 LOOOOOL

Same for the geometry! After ALOT of time spent trying things... Thankfully my friend had reminded me of the ratio of intercepts theory only a few days ago!

So annoyed with question 16. Could only do the limiting sum question and like two marks of a. Probably got 5/15 when I was getting around 8-12 in other papers. Also with the loan repayment, I had two series going. Was that right or did I just make up some Maths? (Probably the latter)

Hahaha, don't worry, there were meant to be two!

[doyouevencheeto]

Can someone please upload the exam paper? I don't care if it's just photos but I want to have a go at it haha

[caitlinlddouglas]

Use the fact that |r| < 1 for a limiting sum to exist

a/(1 - r) = 2
a = 2(1 - r)
Now, -1 < r < 1
1 > -r > -1
2 > 1 - r > 0
4 > a > 0

ahhh far out I got that answer but made my answer a<4!!! Would they award the other marks though?

[RuiAce]

Just saw your paper. Geez some of the stuff looks weird.

Won't address its difficulty nor will I post any solutions (for 2U that's Jamon's job). The questions certainly look manageable but they just...look so weird...

Can someone please upload the exam paper? I don't care if it's just photos but I want to have a go at it haha

I'm afraid we cannot. Copyright issues.

[georgiia]

It's a bit unclear what you're trying to argue I'm afraid. I'd probably have only given that 1

no that was only the last line of working

[ellybubble]

Did anyone get that part in Q16 about the isosceles triangle? I was so confused

I think you had to use the ratio of intercepts on parallel lines to prove that the two sides were equal?

[sajochi]

I think you had to use the ratio of intercepts on parallel lines to prove that the two sides were equal?

Yeah that's what I used

[doyouevencheeto]

Just saw your paper. Geez some of the stuff looks weird.

Won't address its difficulty nor will I post any solutions (for 2U that's Jamon's job). The questions certainly look manageable but they just...look so weird...
I'm afraid we cannot. Copyright issues.

When do you think the paper will be released for viewing on this?

[ellybubble]

Did anyone else find the loan repayment question confusing??

yep, and i'm pretty sure I did it wrong now hahah

[12070]

There should’ve been two series happening at the same time! One attached to X and one attached to the loan repayment subtracted.

Yeah okay sweet. I remember I got 4000 and something but will have to wait for the solutions to see if I got it. Also for the series one where you had to find t10, I found a1 by trial and error but I did get the correct answer I think t10=0. However, would I still get the 3 marks for using trial and error?

[lcamilleri.53]

With the isosceles triangle proof I used similar triangles with the left triangle (i think triangle dbm) and the whole triangle. This then led to sides in proportion which somehow got me to the answer of AD = AC and therefore ADC isosceles

[RuiAce]

no that was only the last line of working

You might be lucky to get a 2 then. You should easily have secured 1 mark just for using the GP sum formula.

Can't promise you the second though

When do you think the paper will be released for viewing on this?

NESA has been relatively fast this year. Hopefully within the next 2-3 days.

[bimberfairy]

Yeah okay sweet. I remember I got 4000 and something but will have to wait for the solutions to see if I got it. Also for the series one where you had to find t10, I found a1 by trial and error but I did get the correct answer I think t10=0. However, would I still get the 3 marks for using trial and error?

Yeah i got t10 = 0 too. You’d definitely get a mark for getting the answer. I’m not too sure about the trial and error method though because i think they intended for you to figure out t4 and the sum then use simultaneous equations.

[RuiAce]

Q11-14 seemed pretty straightforward yeah?

[navtejkr]

That seems similar to what I got

YES I THINK I GOT THAT TOO