A. ${\mathrm{x}}^2 + {\mathrm{y}}^2 + {\mathrm{z}}^2$ + 2x - y - 2z = 0

B.  ${\mathrm{x}}^2 + {\mathrm{y}}^2 + {\mathrm{z}}^2$ + 4x + 2y - 4z = 0

C.  ${\mathrm{x}}^2 + {\mathrm{y}}^2 + {\mathrm{z}}^2$ + 4x - 2y + 4z = 0S

D.  ${\mathrm{x}}^2 + {\mathrm{y}}^2 + {\mathrm{z}}^2$ + 4x - 2y - 4z = 0

A. ${(\mathrm{x} - 1)}^2 + {(\mathrm{y} + 1)}^2 + {(\mathrm{z} - 1)}^2$ = 6

B.  ${(\mathrm{x} - 2)}^2 + {(\mathrm{y} + 1)}^2 + {(\mathrm{z} - 1)}^2$ = 24

C.  ${(\mathrm{x} - 4)}^2 + {(\mathrm{y} + 2)}^2 + {(\mathrm{z} + 2)}^2$ = 24

D.  ${(\mathrm{x} + 2)}^2 + {(\mathrm{y} - 1)}^2 + {(\mathrm{z} + 1)}^2$ = 6

A. ${(\mathrm{x} - 1)}^2 + {(\mathrm{y} + 2)}^2 + {(\mathrm{z} + 3)}^2$ = 3

B.  ${(\mathrm{x} + 1)}^2 + {(\mathrm{y} - 2)}^2 + {(\mathrm{z} - 3)}^2$ = 9

C.  ${(\mathrm{x} + 1)}^2 + {(\mathrm{y} - 2)}^2 + {(\mathrm{z} - 3)}^2$ = 3

D.  ${(\mathrm{x} - 1)}^2 + {(\mathrm{y} + 2)}^2 + {(\mathrm{z} + 3)}^2$ = 9

A. 3

B. 1

C.  $3\sqrt{2}$

D.  $\sqrt{33}$

A. 3

B. 1

C.  $3\sqrt{2}$

D.  $\sqrt{33}$

A. M(3;3;-1)

B. N(2;-1;-2)

C. P(-1;-1;1)

D. Q(2;7;-2)

A.  $\frac{\sqrt{534}}{4}$

B.  $\frac{\sqrt{426}}{6}$

C.  $\frac{\sqrt{530}}{4}$

D.  $\frac{\sqrt{218}}{6}$

A. 4   

B. 1

C.  $3\sqrt{2}$

D. 3