By Margaret L. Lial

Is there whatever extra appealing than an “A” in Algebra? to not the Lial group! Marge Lial, John Hornsby, and Terry McGinnis write their textbooks and accompanying assets with one aim in brain: giving scholars the entire instruments they should be successful. With this revision, the Lial group has additional subtle the presentation and routines during the textual content. they give a number of intriguing new assets for college students that may supply additional support whilst wanted, whatever the studying surroundings (classroom, lab, hybrid, on-line, etc)–new research talents actions within the textual content, an extended video application on hand in MyMathLab and at the Video assets on DVD, and extra!

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**Example text**

What is the difference between these two temperatures? ) 119. 35 in his checking account. 00, which overdraws his account. 50. 27 from his part-time job at Arby’s. What is the balance in his account? 120. 60 in her checking account. 34, which overdraws her account. 00. 66 from her part-time job at Subway. What is the balance in her account? 121. 45 on his Visa account. 50 for credit. 17. (a) How much should his payment be if he wants to pay off the balance on the account? 66. What is the balance on his account?

Because - 17 and 11 have different signs, subtract their absolute values. 17 - 11 = 6 The number - 17 has a greater absolute value than 11, so the answer is negative. - 17 + 11 = - 6 The sum is negative because | - 17 | 7 | 11 |. (b) 4 + 1- 12 Subtract the absolute values, 4 and 1. Because 4 has the greater absolute value, the sum must be positive. 3, The sum is positive because | 4 | 7 | - 1 |. 3 (e) - 16 + 12 The absolute values are 16 and 12. Subtract the absolute values. - 16 + 12 = - 116 - 122 = - 4 (f ) - 4 2 12 10 + = + 5 3 15 15 = -a = - 12 10 b 15 15 2 15 The sum is negative because | - 16 | 7 | 12 |.

Exponents are also called powers. NOW TRY EXERCISE 1 Write using exponents. (a) 1- 321- 321- 32 (b) t # t # t # t # t EXAMPLE 1 Using Exponential Notation Write using exponents. 325 (e) x #x#x#x#x# x = x6 NOW TRY NOTE In Example 1, we used the terms squared and cubed to refer to powers of 2 NOW TRY ANSWERS 1. (a) 1- 323 (b) t 5 and 3, respectively. The term squared comes from the figure of a square, which has the same measure for both length and width, as shown in FIGURE 17(a) . Similarly, the term cubed comes from the figure of a cube, where the length, width, and height have the same measure, as shown in FIGURE 17(b) .