Which company first introduced the handheld graphing calculator that revolutionized high school and college mathematics education in the 1980s?

Product innovation has transformed how mathematics is taught and applied in everyday settings. From ancient abacuses to modern graphing calculators, companies have continuously improved calculation tools to make complex mathematics more accessible. This poll tests your knowledge about a pivotal innovation in mathematical education that revolutionized how students approach complex problems.

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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)