Which company first introduced a commercially successful graphing calculator that became widely adopted in mathematics education during the early 1990s?

The introduction of graphing calculators fundamentally changed how mathematics is taught and learned. These powerful tools transformed abstract concepts into visual representations, making complex mathematics more accessible to students. However, their adoption in education wasn't without controversy, with debates about their impact on fundamental skill development. This poll tests your knowledge about the product history behind these influential educational tools.

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Hewlett-Packard with the HP-28 series
Texas Instruments with the TI-81 and TI-82 series
Casio with the fx-7000G series
Sharp with the EL-9300 series