Which company first successfully mass-marketed graphing calculators to high schools, creating a product that became virtually mandatory for advanced mathematics courses in the 1990s?

The introduction of handheld graphing calculators transformed mathematics education and created an entirely new product category in the educational technology market. These devices changed how students learned complex mathematical concepts and opened up new possibilities for visualizing and solving problems. This poll tests your knowledge about a pivotal moment in the history of educational mathematics tools that shaped an entire generation of STEM students.

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Texas Instruments with the TI-81
Casio with the fx-7000G
Hewlett-Packard with the HP-28S
Sharp with the EL-5200