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The interactive mathematical functions are presented in a series of Excel workbooks. Each item corresponds to a particular feature in the textbook (a figure, equation, math commentary, or example). Look for the 'WWW' icons in the book, which flag those features with corresponding interactive materials on this web site.
To use this resource select the item you would like to explore. Select the spreadsheet labelled 'Introduction' when first opening the Excel workbook; this will give you instructions on how to use that particular item.
Also look out for the suggested activities that accompany each item. Use the resource to help you solve the problems posed in each activity, and hence build a deeper understanding of each mathematical function.