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For 15cii, did you all just substitue x = 2 into the derivative to show that it's a minimum? I solved the equation, got x = -8 and x = 2, then discarded x = -8 (since x is length), and then used the Derivative table to show there's a minimum at x = 2. Do you guys reckon NESA would be expecting...

Was your final answer 24 years? You might be able to still score the 3/3

Okay, that's good to hear. Thanks!

Great, thanks!

For question 15, I used similar triangles rather than Pythogoras' Therom. Idk why I thought it was a similar triangle question. Anyway, I still got the same answer. Attached is my working. Can anyone verify whether it's correct and would warrant 3/3?

This is how I did it (attached). It was definitely tricky but I stared at it during reading time and it somehow clicked

Yep! I confirmed this with a teacher who marks the HSC and he said both would receive the full mark

Did you write -365 leaves / day or as I did? Some others in my class also wrote 'Decreasing at a rate of 365 leaves/day'

Yeah, I doubt they'd deduct a mark for that. Besides, rates are usually positive

For the rate of change question, are we meant to have the negative in the answer like -365 leaves/day. I wrote decreasing at a rate of 365 leaves/day

Any tuition centres upload full solutions yet?

One mark max and yes i made An = 0, thats fine

Do you think band 6 might be a bit lower. Our paper was pretty on par with 2013 I think

Nevermind, you made a typo

They should be equally divided, cant be 0, 0.25, 1

Oh thats your error. you were meant to use 0, pi/4 and pi/2

They may be leniant and ignore the final statement, I'm not sure

I guess so.. because he can withdraw for 24 years, not 6

It says 'Let An be the amount remaining in the account after the nth withdrawal' and 'the person decides to to withdraw $80000 from this account at the end of every fourth quarter'. 'End of 4th quarter' means once per year. Hence An is in years

LMAOO