Which calculator brand was first to successfully market and sell graphing calculators to schools, creating a new educational technology retail category in the 1980s?

The evolution of mathematical calculators has transformed how we teach, learn, and apply mathematics. From basic arithmetic tools to advanced graphing calculators, these devices represent significant retail innovations in the educational technology market. This poll tests your knowledge about a pivotal moment in calculator retail history that changed mathematics education forever.

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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)