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Last edited by InteGrand; 16 Feb 2017 at 6:25 AM.
Not sure what the best way to study for sequences and series, whether it be HSC or IB but should we tell the students to memorise the formulae (even though the formuale sheet is provided)?
| B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Scorchers BBL | Australian Cricket | Casual University Statistics Tutor
| B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Scorchers BBL | Australian Cricket | Casual University Statistics Tutor
| B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Scorchers BBL | Australian Cricket | Casual University Statistics Tutor
This is a Band 7 IB question (equivalent to a HSC Band 6 aiming for 95%+ on paper)
With regards to (b) , would it be OK to not write the answer involving sequences? i.e doing it manually in order to get the marks
My way I did it was just using the 'common sense method':
Notice both answers do give slightly different decimal values .
Last edited by davidgoes4wce; Yesterday at 9:37 PM.
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0.892 and 0.655536 are wrong. By doing it manually like this you are greatly increasing the number of points at which you can mess up the calculation. And of course this won't be feasible if 9 is replaced by 1000.
The correct answer is the expression t8 (although the 2 is +2, not -2), which in decimal form is exactly 15.31564544.
Ps. alarm bells should be ringing in your head at "slightly different decimal values". The only step in which any rounding is involved is at the very end, so these answers should coincide exactly prior to rounding, which they clearly don't.
Last edited by seanieg89; Yesterday at 3:33 PM.
Currently studying:
PhD (Pure Mathematics) at ANU
OK yep I see it
should be 0.8192 metres and 0.65536 metres
| B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Scorchers BBL | Australian Cricket | Casual University Statistics Tutor
| B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Scorchers BBL | Australian Cricket | Casual University Statistics Tutor
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