Letters are used to represent numbers. Say we have a hidden or secret number, we have to put something in its place. So the easiest thing to use is letters, because the alphabet is a fundamental system used for English-speaking people. Anything else would make math far more complicated then it already is.
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Algebra
Algebra.
algebra
The type of Mathletics that uses letters instead of numbers is called algebra. Algebra is a branch of mathematics that uses symbols and letters to represent numbers and describe mathematical relationships and operations. It allows for solving equations and expressing patterns and equations in a general form.
Algebra