Which mathematical product development innovation first allowed for widespread graphing calculator use in high school classrooms?

Product development in the mathematics industry has evolved significantly over the decades, transforming how we teach, learn, and apply mathematical concepts. From basic calculators to advanced AI-driven learning platforms, the journey of mathematical product innovation reflects our changing relationship with numbers and formulas. Test your knowledge about key developments in mathematical product history!

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Texas Instruments' TI-82, which introduced affordable programmable graphing in 1993
Hewlett-Packard's HP-28S, which pioneered Computer Algebra Systems (CAS) in 1988
Casio's fx-7000G, despite being the first graphing calculator in 1985, was too expensive for classroom adoption
Sharp's EL-5200, which introduced the first touchscreen graphing interface in 1991