That link is dead now.
The solutions are not from Sydney Grammar, but a teacher from Baulkham Hills High School - but it originally had errors in 16a. The author was informed about it but chose not to correct it. That is, until I wrote him a rather stern letter which seems to have changed his mind.
So he eventually fixed it and it has a new link now at http://virtualb15.edublogs.org/files/2014/09/sydney-grammar-E2-2013-16zci8g.pdf
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