Which company first introduced the handheld graphing calculator that became a standard requirement in many high school and college mathematics courses during the 1990s?

Before the digital age, mathematics students relied on slide rules and basic calculators. Then came a revolutionary product that transformed how students visualized and understood mathematical concepts. This device became a staple in classrooms worldwide, combining sophisticated computational power with graphing capabilities. Test your knowledge about this influential product that bridged traditional mathematics education with the modern technological era.

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Texas Instruments (with the TI-81 and later the iconic TI-83/84 series)
Hewlett-Packard (with the HP-28 series)
Casio (with the fx-7000G)
Sharp (with the EL-5200)