74 Chapter 1 The Set of Real Numbers Section 1.3 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 For additional exercises, see Classroom Activities 1.3A–1.3B in the Student’s Resource Manual at www.mhhe.com/moh. 1. a. If a and b are both negative, then a b will be (choose one: positive or negative). negative 0b 0 7 0a 0 b. If a and b have different signs, and if , then the sum will have the same sign as (choose one: a or b). 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. A e2, 3 4 , 5 2 , 3, 9 2 , 1.6, 0 f 2 0 1.6 3 34 2 5 2. 3. 4. 5 2 5. 6. 7. 8. Evaluate the expressions. a. 182 8 b. |8| 8 > 3 4 5 < 2 3 4 0 > 1.6 5 9 2 2 > > 2 9 2 3 < 4 2 0 5 4 3 2 1 0 1 2 3 4 5 Concept 1: Addition of Real Numbers and the Number Line For Exercises 9–16, add the numbers using the number line. (See Example 1.) 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 2 142 3 152 7 10 3 2 9 7 9. 6 10. 8 11. 12. 13. 6 132 3 14. 8 122 6 15. 2 152 3 16. 7 132 4 Concept 2: Addition of Real Numbers For Exercises 17–70, add. (See Examples 2–4.) 17. 17 18. 7 19. 20. 19 2 25 18 4 11 7 3 9 6 16 132 12 1232 2 1212 13 112 21. 19 22. 35 23. 23 24. 14 0 152 0 142 3 0 8 0 25. 5 26. 4 27. 3 28. 8 16 16 0 11 1112 0 41 1412 0 15 15 0 29. 30. 31. 32. 33. 4 192 5 34. 6 192 3 35. 7 122 182 3 36. 2 132 162 7 Writing Translating Expression Geometry Scientific Calculator Video
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