Which company first introduced the graphing calculator, revolutionizing how students visualize mathematical functions in the classroom?

Mathematics has evolved significantly over millennia, and so have the tools and products that mathematicians and students use. From ancient counting boards to modern graphing calculators, mathematical tools reflect the technological capabilities of their era while shaping how we learn and apply mathematical concepts. This poll tests your knowledge about the commercial history of mathematical tools that revolutionized education and professional practice.

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