Which company first introduced a commercially successful graphing calculator with the ability to visualize mathematical functions, revolutionizing math education in 1985?

Graphing calculators transformed mathematics education in the late 20th century, making complex functions and visualizations accessible to students everywhere. These powerful tools revolutionized how mathematical concepts could be explored, taught, and understood. Behind these innovations were visionary product designers and companies who pushed the boundaries of what portable computing devices could achieve for mathematics education. Test your knowledge about the history of these transformative mathematical tools!

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Texas Instruments with the TI-81
Hewlett-Packard with the HP-28C
Casio with the fx-7000G
Sharp with the EL-5200