Section 1.4 Addition of Real Numbers 51 Section 1.4 Practice Exercises Study Skills Exercise It is very important to attend class every day. Math is cumulative in nature, and you must master the material learned in the previous class to understand today’s lesson. Because this is so important, many instructors have an attendance policy that may affect your final grade. Write down the attendance policy for your class. Vocabulary and Key Concepts 1. a. If a and b are both negative, then a b will be (choose one: positive or negative). b. If a and b have different signs, and if , then the sum will have the same sign as (choose one: 182 08 0 5 4 3 2 1 0 1 2 3 4 5 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 a or b). Review Exercises Plot the points in set A on a number line.Then for Exercises 2–7 place the appropriate inequality (<, >) between the numbers. 2. 2 0 3. 4. 2 5. 0 6. 1.6 7. 8. Evaluate the expressions. a. b. Concept 1: Addition of Real Numbers and the Number Line For Exercises 9–16, add the numbers using the number line. (See Example 1.) 5 2 3 4 3 4 5 2 5 2 3 4 9 2 A e2, 3 4 , 5 2 , 3, 9 2 , 1.6, 0 f 0b 0 7 0a 0 2 142 3 152 7 10 2 9 9. 10. 11. 12. 6 132 8 122 2 152 7 132 13. 14. 15. 16. Concept 2: Addition of Real Numbers For Exercises 17–70, add. (See Examples 2–4.) 17. 18. 19. 20. 19 2 25 18 4 11 3 9 21. 16 132 22. 12 1232 23. 2 1212 24. 13 112
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