# Mathematics

Reference > Mathematics# Featured Reference

Educational Tutorial and code puzzles: Codes, Decoding and Secret Messages: How codes are used, and different types of codes, including morse code, co

Probability lessons - explanation, examples, and word problems involving probability for high school students

What is a proof? Exploration of various types of proofs and how they are used

How to simplify various kinds of radical expressions, including square roots, cube roots, and expressions with radicals in the denominators

Learn more about polynomials and polynomial equations. How to find solutions, understanding conjugates, relation between roots and coefficients, and t

Solving systems of equations, including systems of two and three unknowns, as well as fractional equations

A unit on rational expressions, including adding, subtracting, multiplying, dividing algebraic fractions, as well as solving fractional equations

A brief unit on calculation, reduction, and uses of determinants

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Codes and Secret Messages, Estimation, Introduction to Proofs, Probability, Slick Math, The Golden Ratio, TI-30X II# Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

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