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86 Chapter 2 Integers and Algebraic Expressions Section 2.1 Integers, Absolute Value, and Opposite Answers 1. 65C 2. $156 3. $2000 1. Integers The numbers 1, 2, 3, . . . are positive numbers because they lie to the right of zero on the number line (Figure 2-1). 1 2 3 4 5 6 Positive numbers 0 Zero 6 5 4 3 2 1 Negative numbers Writing Integers Example 1 0 1 2 3 4 5 6 Zero Positive numbers Write an integer that denotes each number. a. Liquid nitrogen freezes at 346F below zero. b. The shoreline of the Dead Sea on the border of Israel and Jordan is the lowest land area on Earth. It is 1300 ft below sea level. c. Jenna’s 10-year-old daughter weighs 14 lb more than the average child her age. Solution: a. 346F b. 1300 ft c. 14 lb le 1 Figure 2-1 In some applications of mathematics we need to use negative numbers. For example: • On a winter day in Buffalo, the low temperature was 3 degrees below zero: 3 • A golfer’s score in the U.S. Open was 7 below par: 7 • Carmen is $128 overdrawn on her checking account. Her balance is: $128 The values 3, 7, and $128 are negative numbers. Negative numbers lie to the left of zero on a number line (Figure 2-2). The number 0 is neither negative nor positive. Figure 2-2 The numbers . . . 3, 2, 1, 0, 1, 2, 3, . . . and so on are called integers. Concepts 1. Integers 2. Absolute Value 3. Opposite Skill Practice Write an integer that denotes each number. 1. The average temperature at the South Pole in July is 65C below zero. 2. Sylvia’s checking account is overdrawn by $156. 3. The price of a new car is $2000 more than it was one year ago.


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