What if you could write one rule that works for ANY number not just one specific case? That is the magic of Algebra! When we write "5n" we mean "5 times whatever number n is" so n = 1 gives 5, n = 100 gives 500, n = 0.5 gives 2.5. One expression, infinite possibilities! Algebraic expressions are the language of patterns they describe rules that hold true forever, from calculating phone data costs to designing engineering structures. Today we learn to read, write, and simplify these powerful expressions. Ready to speak the language of patterns? Let us begin!