Question

Identify and sketch the surfaces in Exercises 65–76.

65. x2 + y2 + z2 = 4

66. x2 + (y - 1)2 + z2 = 1

67. 4x2 + 4y2 + z2 = 4

68. 36x2 + 9y2 + 4z2 = 36

69. z =-(x2 + y2)

70. y =-(x2 + z2 ) 

71. x2 + y2 = z2

72. x2 + z2 = y2

73. x2 + y2 - z2 = 4

74. 4y2 + z2 - 4x2 = 4

75. y2 - x2 - z2 = 1

76. z2 - x2 - y2 = 1

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