By saying unrealistic marks like that ur disheartening her.
Ill be honest if you pickup your maths mark you could pull a 90+
At the moment your at mid 80's
i. Dv/dt=4
ii.V=2e^t-2e^-t
iii.3=2e^t-2e^-t
3=2e^t-2/e^t
3et=2e^2t-2
.:2e^2t-2e^t-2=0
iv.Im seeing you changed the question from the one in the HSC. Makes it a bit harder :(
Thats a good question.
at t=1 N=Ae^k=1.6x10^9
at t=2 N=Ae^2k = 2.6x10^9
A=2.6x10^9/e^2k=1.6x10^9/e^k
.:e^k=2.6x10^0/1.6x10^9
.:k=ln(13/8)
.:A=1.6x10^9/e^k
.:A=12800/13x10^6
Part ii the answer is November 2010
I've gone hard out this whole year. Im taking it easy with the study doing like 6-7 hours a day. Keep it light. Sometimes i dont want to kill myself so i wont both studying more then 4 hours. If you're cramming now you're screwed.
You need to keep practicing past papers. That is the only way your gonna bump up your mark. Well your extension history might save you considering you hammer that. Just keep doing more work. Im sure you can pick it up.
Thanks for the vote of confidence namu. i was actually shitting it cuz i stuffed up this year and ended up 6/50. But if i get a really high mark i can still beat people in front of me?
They will only take your Top 10 units so even if you do crap in it, it will not effect your mark. best to stick it out and do the test. You might surprise yourself.