Which packaging innovation for mathematics textbooks was first introduced in the 1990s and led to a 40% increase in student engagement according to industry studies?

The mathematics textbook industry has evolved significantly in how publishers package and present their products to students and educators. From traditional hardbound books to modern interactive solutions, packaging innovations have changed how mathematical concepts are delivered. This trivia question focuses on a notable packaging innovation that revolutionized how students interact with mathematical content.

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Detachable solution manuals with tear-out practice exams
Bundled CD-ROMs with interactive problem sets and graphing tools
Color-coded chapter tabs with formula quick-reference guides
Spiral-bound notebooks with embedded calculation grids