• A mathematical Expression is a combination of symbols that can designate numbers (constants), variables, operations, symbols of grouping and other punctuation.


• Literal Numerals are letters that stand for numbers (e.g. a, b, x, y).


• A Constant represents a known value in an algebraic expression.


• A Variable is a symbol that represents a changeable or undetermined quantity in an algebraic expression.


• Operations include addition, subtraction, multiplication, division and exponentiation.


• Grouping Symbols include parentheses (), curly brackets {}, or square brackets [].