Which company's graphing calculators became so dominant in mathematics education that they're often specifically required by name in course syllabi across North America?

Throughout history, certain brands have become synonymous with mathematical tools and equipment. From calculators to geometry sets, these companies have shaped how mathematics is taught and practiced. This trivia tests your knowledge of iconic math product branding and their impact on the industry. Can you identify which company revolutionized the graphing calculator market in education?

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Texas Instruments
Casio
HP (Hewlett-Packard)
Sharp