Which calculator brand first introduced affordable graphing calculators to schools in the 1980s, revolutionizing how students could visualize mathematical functions?

In the world of mathematics education, certain brands have revolutionized how we learn and teach. From basic calculators to advanced graphing tools, these companies have shaped generations of mathematicians, engineers, and scientists. This poll tests your knowledge about a significant product innovation that transformed the accessibility and understanding of higher mathematics for students worldwide. Do you know which product made complex mathematical visualization accessible to the masses?

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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)