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f(x ) 6 3. x 3 6 9. Answers to Hmwk. 7-4: p.405 # 13–49 left column, 54, 56–59, 69. 40. 2 . 066 46 . 4 . 647 . 54. If all the powers in the result of an even root have even exponents, the result is nonnegative without taking the absolute value. 56. B 57. G
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f(x) 6 3 x 369 . Answers to Hmwk. 7-4: p.405 #13–49 left column, 54, 56–59, 69 40. 2.066 46. 4.647 54. If all the powers in the result of an even root have even exponents, the result is nonnegative without taking the absolute value • 56. B 57.G • 58. D = {x/x ≥2} • R = {y/y ≥ 0} Answers to Practice 7-5: p.412 #1–7 odd, 8–16 left column 8. ≈ 49mi/hr10. 2a2b212. 5+ 3 • 14. 3 + 3 – – 16. 2 + ––––––––––––––––––––––––––––––––––––––––––––––––––––––––– Hmwk. 7–5: p.413 #18–51mod3, 53–57, 62, 63, 66, 70, 77