Algebra for College Students (5th Edition) (MathXL Tutorials by Margaret L. Lial

By Margaret L. Lial

The Lial sequence has helped millions of scholars achieve developmental arithmetic via its pleasant writing kind, quite a few reasonable examples, vast challenge units, and whole vitamins package deal. according to its confirmed song checklist, this revision encompasses a new open layout, extra routines and purposes, and extra beneficial properties to assist either scholars and teachers prevail.

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Additional resources for Algebra for College Students (5th Edition) (MathXL Tutorials on CD Series)

Sample text

Round answers to the nearest tenth of a percent. (a) 1980 (b) 1990 (c) 2000 (d) How has the percent of households investing in mutual funds changed from 1980 to 2000? An Addison-Wesley product. Copyright © 2004 Pearson Education, Inc. 32 CHAPTER 1 Review of the Real Number System 94. 86, where x represents the year. S. ) (a) Use this expression to complete the table. Round answers to the nearest tenth. 8 (b) Describe the trend in the amount of federal spending on education during these years. An Addison-Wesley product.

Which equations are linear equations in x? A. 3x ϩ x Ϫ 1 ෇ 0 B. 8 ෇ x 2 C. 6x ϩ 2 ෇ 9 D. 1 1 xϪ ෇0 2 x 2. Which of the equations in Exercise 1 are nonlinear equations in x? Explain why. 3. Decide whether 6 is a solution of 3͑x ϩ 4͒ ෇ 5x by substituting 6 for x. If it is not a solution, explain why. 4. Use substitution to decide whether Ϫ2 is a solution of 5͑x ϩ 4͒ Ϫ 3͑x ϩ 6͒ ෇ 9͑x ϩ 1͒. If it is not a solution, explain why. 5. The equation 4͓x ϩ ͑2 Ϫ 3x͔͒ ෇ 2͑4 Ϫ 4x͒ is an identity. Let x represent the number of letters in your last name.

He gave the solution set as ͞0. Why is this incorrect? 52. Explain the distinction between a conditional equation, an identity, and a contradiction. Decide whether each equation is conditional, an identity, or a contradiction. Give the solution set. See Example 5. 53. Ϫ2p ϩ 5p Ϫ 9 ෇ 3͑ p Ϫ 4͒ Ϫ 5 54. Ϫ6k ϩ 2k Ϫ 11 ෇ Ϫ2͑2k Ϫ 3͒ ϩ 4 55. 6x ϩ 2͑x Ϫ 2͒ ෇ 9x ϩ 4 56. Ϫ4͑x ϩ 2͒ ෇ Ϫ3͑x ϩ 5͒ Ϫ x 57. Ϫ11m ϩ 4͑m Ϫ 3͒ ϩ 6m ෇ 4m Ϫ 12 58. 3p Ϫ 5͑ p ϩ 4͒ ϩ 9 ෇ Ϫ11 ϩ 15p 59. 7͓2 Ϫ ͑3 ϩ 4r͔͒ Ϫ 2r ෇ Ϫ9 ϩ 2͑1 Ϫ 15r͒ 60.