Which calculator brand first introduced the graphing calculator to the educational market, revolutionizing how mathematics was taught in classrooms?

Test your knowledge about the historical development of mathematical tools and their brand evolution! This poll explores how calculating and mathematical instruments have transformed over time and become essential tools for students, educators, and professionals. Understanding the history behind these tools gives insight into how mathematical learning and practice has evolved through commercial innovation.

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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 1986)