Which company first introduced the iconic 'Graphing Calculator' that revolutionized how students visualized mathematical functions in the 1980s?

Before sophisticated calculators and computers transformed mathematics education and research, various companies created iconic tools that shaped how we learn and practice math. These famous products revolutionized calculation, visualization, and problem-solving, becoming staples in classrooms and professional settings worldwide. Test your knowledge of these influential mathematical product innovations!

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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)