O Octagon An eight-sided figure. Odd integer Integers that are not exactly divisible by 2, such as ..., -3, -1, 1, 3, 5, 7, ... Odd roots Radicals with indexes of 3,5,7,...are said to be odd roots. Odometer A device on an automobile that displays how many miles the car has been driven since it was first put into operation. One-to-one function A function in which no two different ordered pairs have the same second coordinate. Operation The basic operations of arithmetic are addition, subtraction, multiplication, and division. Opposite of a signed number The opposite of a signed number is a number that has the same absolute value. The opposite of -5 is 5. The opposite of 7 is -7. Order of operations an agreed-upon procedure to do a problem with several arithmetic operations in the proper order. Order or sense of an inequality The direction of the inequality symbol. Ordered pair A pair of numbers represented in a specified order. An ordered pair is used to identify the location of a point. Every point on a rectangular coordinate system can be represented by an ordered pair (x, y). Origin The point determned by the interesection of the x-axis and the y-axis. It has the coordinates (0,0). Ounce Smallest unit of weight in the American system. 16 ounces = 1 pound. Overtime The pay earned by a person if he or she works more than a certain number of hours per week. In most jobs that pay by the hour, a person will earn times as much per hour for every hour beyond 40 hours worked in one work week. For example, Carlos earns \$6.00 per hour for the first 40 hours in a week and overtime for each additional hour. He would earn \$9.00 per hour for all hours he worked in that week beyond 40 hours.

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