Which calculator innovation is credited with making advanced mathematics accessible to mainstream consumers and became one of the most successful retail math products of the 1970s?

The calculator market has seen dramatic evolution since the 1970s, revolutionizing how mathematics is taught and practiced. This poll explores a pivotal innovation that transformed calculators from specialized tools to mainstream retail products that dramatically changed mathematics education and professional practice. Test your knowledge about this significant retail success story that made mathematical computation accessible to millions worldwide.

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Texas Instruments' TI-30, the first scientific calculator priced under $25, selling over 15 million units in its first 5 years
Hewlett-Packard's HP-35, the first scientific pocket calculator, though revolutionary was priced at $395 limiting its mainstream appeal
Casio's FX-7000G, the first graphing calculator, though innovative didn't achieve mass market success until the 1980s
Sharp's EL-8, which pioneered LED display technology but at $345 remained primarily for professional use