College Algebra (9th Edition) by Michael Sullivan

By Michael Sullivan

Collage Algebra, 9/E
Michael Sullivan, Chicago country University
ISBN-10: 0321716817 • ISBN-13: 9780321716811
©2012 • Pearson • textile, 840 pp
Published 01/04/2011 • Instock

Suggested retail expense: $206.00

Mike Sullivan’s time-tested technique focuses scholars at the basic talents they want for the direction: getting ready for sophistication, training with homework, and reviewing the suggestions. within the 9th version, collage Algebra has advanced to fulfill today’s path wishes, development on those hallmarks through integrating initiatives and different interactive studying instruments to be used within the school room or online.

New Internet-based bankruptcy tasks observe abilities to real-world difficulties and are observed via assignable MathXL workouts to help you include those tasks into the direction. additionally, quite a few new workout varieties, exhibit Examples, and video tutorials for MathXL workouts supply teachers much more flexibility, whereas assisting scholars construct their conceptual figuring out.

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Example text

During the next month, he deposited $80, wrote a check for $120, made another deposit of $25, wrote two checks: one for $60 and the other for $32. He was also assessed a monthly service charge of $5. What was his balance at the end of the month? In Problems 147 and 148, write an inequality using an absolute value to describe each statement. 147. x is at least 6 units from 4. 148. x is more than 5 units from 2. 149. S. Voltage In the United States, normal household voltage is 110 volts. It is acceptable for the actual voltage x to differ from normal by at most 5 volts.

A more formal definition of absolute value is given next. The absolute value of a real number a, denoted by the symbol ƒ a ƒ , is defined by the rules ƒ a ƒ = a if a Ú 0 and ƒ a ƒ = -a if a 6 0 For example, since -4 6 0, the second rule must be used to get ƒ -4 ƒ = -1-42 = 4. EXAMPLE 3 Computing Absolute Value (a) ƒ 8 ƒ = 8 (b) ƒ 0 ƒ = 0 (c) ƒ -15 ƒ = -1-152 = 15 ᭹ Look again at Figure 13. The distance from -4 to 3 is 7 units. This distance is the difference 3 - 1-42, obtained by subtracting the smaller coordinate from the larger.

Collectively, the symbols 6, 7, …, and Ú are called inequality symbols. Note that a 6 b and b 7 a mean the same thing. It does not matter whether we write 2 6 3 or 3 7 2. Furthermore, if a 6 b or if b 7 a, then the difference b - a is positive. Do you see why? Using Inequality Symbols (a) 3 6 7 (d) -8 6 -4 (b) -8 7 -16 (e) 4 7 -1 (c) -6 6 0 (f) 8 7 0 ᭹ In Example 1(a), we conclude that 3 6 7 either because 3 is to the left of 7 on the real number line or because the difference, 7 - 3 = 4, is a positive real number.

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