Which company first marketed a graphing calculator specifically designed for mathematics education, creating an entirely new product category that became standard in high schools and universities?

In the world of mathematics education, technological tools have transformed how students learn complex concepts. One of the most significant product innovations was the graphing calculator, which revolutionized how students visualize and interact with mathematical functions. This poll tests your knowledge about the marketing and product development history behind these influential educational tools that changed mathematics instruction forever.

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Casio with the fx-7000G in 1985
Texas Instruments with the TI-81 in 1990
Hewlett-Packard with the HP-28C in 1987
Sharp with the EL-5200 in 1986