92 Chapter 2 Integers and Algebraic Expressions Late spring and summer rainfall in the Lake Okeechobee region in Florida is important to replenish the water supply for large areas of south Florida. Each bar in the graph indicates the number of inches of rainfall above or below average for the given month. Use the graph for Exercises 92–94. 92. Which month had the greatest amount of rainfall below average? What was the departure from average? 93. Which month had the greatest amount of rainfall above average? 94. Which month had the average amount of rainfall? Expanding Your Skills For Exercises 95 and 96, rank the numbers from least to greatest. 95. 046 0 , 1242, 60, 52, 012 0 96. 15, 1182, ,42, 020 0 03 0 2 97. If a represents a negative number, then what is the sign of a? 98. If b represents a negative number, then what is the sign of 99. If c represents a negative number, then what is the sign of 0b 0 ? 0c 0 ? 100. If d represents a negative number, then what is the sign of 1d2? Rainfall Amounts Above or Below Average Departure from Average (in.) 6 4 2 0 2 4 6 8 May June July Aug. Sept. Section 2.2 Addition of Integers 1. Addition of Integers by Using a Number Line Addition of integers can be visualized on a number line. To do so, we locate the first addend on the number line. Then to add a positive number, we move to the right on the number line. To add a negative number, we move to the left on the number line. This is demonstrated in Example 1. Using a Number Line to Add Integers Example 1 Use a number line to add. a. 5 3 b. 5 3 Solution: a. 5 3 8 Move 3 units right. 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 Start here. Begin at 5.Then, because we are adding positive 3, move to the right 3 units. The sum is 8. Concepts 1. Addition of Integers by Using a Number Line 2. Addition of Integers 3. Translations and Applications of Addition Skill Practice Use a number line to add. 5 4 3 2 1 0 1 2 3 4 5 1. 3 2 2. 3 2 Answers 1. 5 2. 1
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