9.
No
Yes
11.
Yes
No
13.
Yes
Yes
15. (−∞,−2)∪(−2, 1)∪(1, ∞)
17. (−∞, 3)∪(3, 4)∪(4, ∞)
19. No, x=0
21. Yes
23. {3}
25. {−2}
27. {7}
29. {−1}
31. {6}
33. {12}
35. {1}
37. {−11}
39. {236}
41. {78}
43. {2}
45. {28}
47. {45}
49. r=dt
51. r=C2π
53. R=EI
55. h=2Aa+b
57. u=fvv−f
59. m=y−bx
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