Which company first introduced the graphing calculator that became a staple in mathematics education during the 1990s?

The graphing calculator transformed mathematics education and professional practice in the late 20th century. These powerful handheld devices changed how students learn algebra, calculus, and statistics by allowing visual representation of complex functions and data analysis on the go. This poll tests your knowledge about a pivotal product innovation that shaped modern mathematical education and practice.

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