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Учебные пособия > College Algebra

Solutions to Selected Exercises

Solutions to Try Its

1. 11 and 25 2. C=2.5x+3,650C=2.5x+3,650 3. 45 mi/h 4. L=37L=37 cm, W=18W=18 cm 5. 250 ft2

Solutions to Odd-Numbered Exercises

1. Answers may vary. Possible answers: We should define in words what our variable is representing. We should declare the variable. A heading. 3. 2,000x2,000-x 5. v+10v+10 7. Ann: 2323; Beth: 4646 9. 20+0.05m20+0.05m 11. 300 min 13. 90+40P90+40P 15. 6 devices 17. 50,000x50,000-x 19. 4 h 21. She traveled for 2 h at 20 mi/h, or 40 miles. 23. $5,000 at 8% and $15,000 at 12% 25. B=100+.05xB=100+.05x 27. Plan A 29. R=9R=9 31. r=45r=\frac{4}{5} or 0.8 33. W=P2L2=582(15)2=14W=\frac{P - 2L}{2}=\frac{58 - 2\left(15\right)}{2}=14 35. f=pqp+q=8(13)8+13=10421f=\frac{pq}{p+q}=\frac{8\left(13\right)}{8+13}=\frac{104}{21} 37. m=54m=\frac{-5}{4} 39. h=2Ab1+b2h=\frac{2A}{{b}_{1}+{b}_{2}} 41. length = 360 ft; width = 160 ft 43. 405 mi 45. A=88 in.2A=88\text{ in}{.}^{2} 47. 28.7 49. h=Vπr2h=\frac{V}{\pi {r}^{2}} 51. r=Vπhr=\sqrt{\frac{V}{\pi h}} 53. C=12πC=12\pi

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