# Intermediate algebra by Margaret L Lial; E John Hornsby; Terry McGinnis

By Margaret L Lial; E John Hornsby; Terry McGinnis

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Extra info for Intermediate algebra

Sample text

The grandson explained that the answer is 14 because of the “Order of Process rule” which says that in a problem like this, you proceed from right to left rather than left to right. ) (a) Whose answer was correct for this expression, Frank’s or his grandson’s? (b) Was the reasoning for the correct answer valid? Explain. Simplify each expression. Use the order of operations. See Examples 4–6. 53. 12 + 3 55. 6 # # 54. 15 + 5 4 3 - 12 , 4 # 57. 10 + 30 , 2 56. 9 # # 2 4 - 8 , 2 58. 12 + 24 , 3 3 # 2 59.

What is the difference between these two temperatures? ) 118. On August 10, 1936, a temperature of 120°F was recorded in Ponds, Arkansas. On February 13, 1905, Ozark, Arkansas, recorded a temperature of - 29°F. 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.

Find square roots. As we saw in Example 2(a), 52 = 5 # 5 = 25, so 5 squared is 25. The opposite (inverse) of squaring a number is called taking its square root. For example, a square root of 25 is 5. Another square root of 25 is - 5, since 1- 522 = 25. Thus, 25 has two square roots: 5 and - 5. OBJECTIVE 2 NOW TRY ANSWERS 2. (a) 49 (b) 49 (c) - 49 26 Review of the Real Number System CHAPTER 1 We write the positive or principal square root of a number with the symbol ͙ , called a radical symbol. For example, the positive or principal square root of 25 is written ͙ 25 = 5.