Which company first mass-produced affordable graphing calculators for high school mathematics education in the 1980s, making advanced mathematical visualization accessible to students?

In the world of mathematics education, certain products have revolutionized how students learn and visualize complex concepts. From basic instruments to sophisticated software, these tools have shaped mathematical understanding for generations. This poll explores the historical development of one particular category of math education products that transformed classrooms worldwide. Test your knowledge about the evolution of these essential learning tools!

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