Suggested Answers to the HSC 2016 Mathematics Exam (+Discussion!)

[jamonwindeyer]

question 14 is simpsons rule,  therefore it will 2/6 in front of the brackets not 2/2 

Ohhh thank you! I was looking at the numbers inside, must have glanced at the Trapezoidal Rule above it, thanks for the correction guys!

[RobotoRaccoon]

You did the very last question wrong, you don't want when dy/dt = 0, you want when it's derivative does

[bohimei]

Isnt the last one about maximising the rate of growth not maximising growth? I differentiated the Rate=y.....
I got y = 100 eventually. idk please clear my confusion

[AdrianJW]

Q11b correct answer should be -10/(3x-4)^2

[jamonwindeyer]

I think b of question 11

You did the very last question wrong, you don't want when dy/dt = 0, you want when it's derivative does

Isnt the last one about maximising the rate of growth not maximising growth? I differentiated the Rate=y.....
I got y = 100 eventually. idk please clear my confusion

All good catches (especially that last one, yikes, that's what you get for rushing); fixing all of them now!

[itsAnuu]

Also for 14cii) you are correct in finding x as 12, however you conclude saying the minimum length of fencing is 12m, whereas you must sub this into l to find the actual length

[hungrybubbles]

the one where you write n=11, the geometric series goes to r^n-2, so in the sum formula its r^n-1 not r^n, n=12

[jamonwindeyer]

the one where you write n=11, the geometric series goes to r^n-2, so in the sum formula its r^n-1 not r^n, n=12

Also for 14cii) you are correct in finding x as 12, however you conclude saying the minimum length of fencing is 12m, whereas you must sub this into l to find the actual length

Both also correct, ta!

[Blissfulmelodii]

Which question are we at here? If I agree I'll fix it up!

Can you give me the alternative? I think its okay but I could be wrong

the -10 in the numerator is for 11b. I myself just did the question and i got -10/(3x-4)^2

[jamonwindeyer]

the -10 in the numerator is for 11b. I myself just did the question and i got -10/(3x-4)^2

Have already corrected this and will upload in the next batch!

[Blissfulmelodii]

Have already corrected this and will upload in the next batch!

ok cool 
I feel as if the difficulty in this paper begins around question 14 onwards. Does anyone else agree?

[pikachu975]

Do you think we'll lose a mark for not testing y = 100 in the last question?

[browny2409]

For 2 marks I doubt it - probably one for differentiating and one for getting y=100 I think it will be alright

Also.. I can't see any working for Qtn 15 c (all parts) in the solutions ?? Is this just me?

[itsAnuu]

For the last part, dont you need to find the time when y = 100 and sub it back into the original y, cause i got y = 100 and i did so much other shit,

[kimmie]

so what do you guys think the cut off would be for a band 6?