Which calculator company first introduced a graphing calculator specifically marketed to mathematics education, creating a new consumer category that became standard in classrooms?

The introduction of affordable electronic calculators dramatically changed how students and professionals approached mathematics. This poll explores how the calculator market evolved and how it influenced consumer behavior in mathematics education and professional practice. Test your knowledge about this transformative product category that revolutionized mathematical accessibility.

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Texas Instruments (with the TI-81 in 1990)
Casio (with the fx-7000G in 1985)
Hewlett-Packard (with the HP-28C in 1987)
Sharp (with the EL-5200 in 1992)