Which company first successfully mass-marketed graphing calculators for education, creating a brand so dominant that their products became synonymous with graphing calculators in many classrooms?

The introduction of graphing calculators transformed mathematics education and professional practice in the late 20th century. These devices bridged computational tools with visual representations, allowing users to plot functions, solve complex equations, and visualize mathematical concepts. Beyond their technical capabilities, these products represented significant product design innovations and brand positioning strategies in educational technology. Test your knowledge about this pivotal product development in mathematics history!

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Texas Instruments with their TI-81 series
Hewlett-Packard with their HP-28 series
Casio with their fx-7000G series
Sharp with their EL-5200 series