Variable - is a letter that represents a number or quantity whose value may change, Constant - is a number whose value always stays the same, Expression - is a number, a variable, or a combination of numbers and variables and operation symbols, Equation - is made up of two expressions connected by an equal sign, Addition - a plus b, Subtraction - a minus b, Multiplication - a • b, (a)(b), (a)b, a(b), Division - a ÷ b, a / b, ab, a ≠ b - a is not equal to b, Exponent - tells us how many factors of the base we have to multiply,

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