Which company first introduced a commercially successful graphing calculator that became widely adopted in mathematics classrooms during the early 1990s?

The development of graphing calculators revolutionized mathematics education in the late 20th century, transforming how students learn complex mathematical concepts. These devices bridged abstract mathematics with visual representation, making calculus, statistics, and algebra more accessible. From basic computation to sophisticated 3D graphing, these retail innovations changed both classroom learning and professional applications of mathematics.

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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)