Which calculator brand first introduced the graphing calculator that revolutionized mathematics education in the late 1980s?

Throughout history, certain brands have dominated the mathematics education and professional space with innovative products that changed how we calculate and visualize mathematical concepts. These products often became synonymous with mathematical education itself. Test your knowledge about the revolutionary products that shaped mathematical learning and practice across generations.

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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)