Which calculator brand first introduced the graphing calculator to mainstream education markets, revolutionizing how students visualized mathematical functions?

The world of mathematics education has seen significant retail innovations over the decades, transforming how students learn and engage with mathematical concepts. From basic calculators to advanced software, certain products have revolutionized mathematics education and practice. This poll tests your knowledge about a pioneering retail brand that fundamentally changed how mathematics was taught and learned in classrooms worldwide.

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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 1988)