A proven teaching and learning formula for the new Queensland senior mathematics courses. If you are using a second-hand textbook you need to activate the 16-character reactivation code inside this sealed pocket, together with the 16-character code for the student textbook, to access the Specialist Mathematics Units 3&4 for Queensland Interactive Textbook powered by Cambridge HOTmaths. The Interactive Textbook is available as a calendar-year subscription. Your subscription term is defined as follows: if activation occurs between January and July of this year, subscription concludes 31 December of this year. If activation occurs between August and December of this year, subscription concludes 31 December the following year.