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natural numbers 1, 2, 3, 4... whole numbers 0, 1, 2, 3.... integers -3, -2, -1, 0, 1, 2, 3... rational numbers -1/2, 7, 3.25 irrational numbers pie, square roots.... real numbers any number coordinate each point on a number line or graph is paired with exactly two real numbers graph each number is paired with a point on a number line, called a... origin The graph of 0 is less than < is greater than > absolute value the distance between the graph of a number and the origin on a number line. numerical expression symbol or group of symbols used to represent a number numeral synonym for number value of an expression number represented by the expression equation a sentence formed by placing a = between two expression inequality a sentence formed by placing a<, >, or an unequal sign between two expressions sum results of adding numbers term the numbers added together to reach a sum difference result of subtracting one number from the other product result of multiplying numbers factor the numbers multiplied to reach a product quotient results of dividing one number by another power product of equal factors base repeated factor when in use with a power exponent the number of times to multiply a base by when being raised to a power simplifying an expression to replace an expression with the simplest or most common symbol having the same value evaluating an expression finding the value of the expression variable symbol used to rpresent any member of a given set domain a given set of numbers that can replace the variable values of a variable members of the domain of the variable algebraic expression a numerical expression, a variable, or a sum, difference, product, or quotient that contains one or more variables open sentence equation or inequality with variable solution or root any value or variable that make open sentence true and to satisfy it solution set set of all solutions to an open sentence Equivalent Equations equations having the same solution set solving an equation transforming an equation into simpler equivalent whose solution set is clearly stated