Which of these mathematical brand mascots was created by Texas Instruments in the 1990s to promote graphing calculators to students?

Throughout the history of mathematics education, various brands have created memorable mascots to make learning math more engaging and accessible. These characters have helped generations of students connect with mathematical concepts through textbooks, software, and educational tools. Test your knowledge of these iconic mathematical brand ambassadors that have shaped how we learn and perceive mathematics!

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Digit the Mathematician - a cartoon number with glasses who solved equations
Calculus Carl - a friendly chalk character who demonstrated calculus principles
Derive Dan - a computer-animated tutor who walked students through mathematical software
Calcu-Dude - a radical 90s character with sunglasses and a skateboard who showed calculator functions