Which company first successfully marketed the graphing calculator as a mainstream educational tool in the 1980s, revolutionizing how students visualized mathematical concepts?

Throughout history, mathematics education has been shaped by innovative tools and products. From ancient counting devices to modern digital platforms, companies have revolutionized how we learn and apply mathematical concepts. This quiz tests your knowledge about breakthrough products that changed mathematical education and practice. Can you identify which famous brand pioneered a particular innovation that transformed mathematical learning?

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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)