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real numbers the set of numbers that includes rational and irrational numbers. origin the point of intersection of coordinate axes negative numbers numbers less than zero positive numbers A number greater than zero (1,2,3,4, etc.) Integers the set of positive whole numbers and their oppposites(negative numbers) and 0 opposites two numbers who's some is 0 absolute value The distance a number is from zero on a number line terms of an expression the parts that are added together; a term may be a number, a variable, or a product of a number and a variable or variables distributive property 3 x (4 + 2) = (3 x 4) + (3 x 2) coefficient a constant number that serves as a measure of some property or characteristic like terms Expressions that contain the same variables to the same power constant terms terms with no variable factors. for example, in x+2-5x-4, the constant terms are 2 and -4 simplified expressions making expressions easy to solve reciprocal (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2 probability of an event When outcomes are equally likely.. P(E)= number of favorable outcomes/total number of possible outcomes. outcomes Outcomes are the possible results or consequences of an action. constant a quantity that does not vary theoretical probability Probability based on comparing the number of possible favorable outcomes to the number of total possible outcomes favorable outcomes the outcomes for the particular event you are considering experimental probability Favorable outcome divided by the number of trials. odds the probability of a specified outcome real number line any rational or irrational number (absolute value, addition of) graph of a number the point the corresponds to a number (number line) plotting a point The Cartesian coordinate system uses two numbers to identify a point on a graph.