Which mathematical product design innovation from the 1970s democratized complex calculations in classrooms and is credited with shifting mathematical education away from slide rules?

Throughout history, mathematical tools have evolved dramatically, transforming how we calculate, analyze data, and solve complex problems. From ancient abaci to modern computational devices, these products have shaped mathematical practice and education. This trivia question explores a significant product design milestone that revolutionized mathematical accessibility in educational settings.

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Texas Instruments TI-30 scientific calculator (1976)
HP-35 scientific calculator (1972)
Casio fx-7000G graphing calculator (1985)
Apple II with VisiCalc spreadsheet software (1979)