Discussion and Suggested Solutions - Mathematics 2017

[taylorlucy]

Wasn't it worth like 3 marks? or was it 2?

Yep that was worth 3 marks! Thought I must be doing something wrong considering I only had a few lines of working and it was in Q16, but I got 0<a<4 too! Perhaps there was a trick I missed, but I hope not!

[adelaidecruz]

Did anyone else find the loan repayment question confusing??

[1MARIE1]

Did anyone else find the loan repayment question confusing??

Yeah, it was kind of weird. It took me ages to get to the answer for the second part

[sajochi]

Did anyone else find the loan repayment question confusing??

At first, yes. I thought she only deposited one initial sum of X so money was only withdrawn and thus I couldn't match the required result, but I came back to it later and realised she deposited $X per month and managed to get it out.

[georgiia]

Ahh right. After I saw what was above I instantly questioned if it had to do with the |r|<1 scenario.

Still though, I want to see the exact wording of this Q...

How many of the 3 marks could I potentially get for getting to this line of working:

a= 2(1-r)  ,   -1<r>1

?
Thanks!

[georgiia]

At first, yes. I thought she only deposited one initial sum of X so money was only withdrawn and thus I couldn't match the required result, but I came back to it later and realised she deposited $X per month and managed to get it out.

Did anyone get something around $4608 or something like that for that question?

 (The value of X)

[Zainbow]

Did anyone get something around $4608 or something like that for that question?

 (The value of X)

That seems similar to what I got

[sajochi]

How many of the 3 marks could I potentially get for getting to this line of working:

a= 2(1-r)  ,   -1<r>1

?
Thanks!

I'm not sure sorry, I'd say one or possibly two. I could be wrong but I think the best way to show it was using limits as r approaches 1 and -1 (by considering both solutions of | r | < 1 )

[RuiAce]

How many of the 3 marks could I potentially get for getting to this line of working:

a= 2(1-r)  ,   -1<r>1

?
Thanks!

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

[bimberfairy]

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

[12070]

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)

[bimberfairy]

Did anyone get something around $4608 or something like that for that question?

 (The value of X)

I got $4019 for it?? And i forgot the amount of cents that i rounded to LOL

[caitlinlddouglas]

Same
Did anyone manage to get the x value for the bicycles?

I got x = 3.75

[K9810]

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

[bimberfairy]

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)

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