Which company first successfully launched and mass-marketed graphing calculators for educational mathematics in the 1980s, revolutionizing how math was taught in classrooms?

In the 1980s, a revolutionary product transformed how mathematics was taught and learned in classrooms worldwide. This device allowed students to visualize complex functions, solve equations graphically, and explore mathematical concepts interactively. The launch of this product marked a significant shift in mathematics education technology, bridging abstract concepts with visual representation. Test your knowledge about this groundbreaking product launch that forever changed mathematics education.

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Texas Instruments with the TI-81 in 1990
Hewlett-Packard with the HP-28C in 1987
Casio with the fx-7000G in 1985
Sharp with the EL-5200 in 1986