A.\(D = R\)   
B.\(D = \left( { - \infty ;0} \right) \cup \left( {1; + \infty } \right)\)
C.\(D = R\backslash \left\{ {0;1} \right\}\)  
D.\(D = \left( { - \infty ;0} \right] \cup \left[ {1; + \infty } \right)\)

A.\({\left( {x + 2} \right)^2} + {\left( {y - 5} \right)^2} + {\left( {z - 1} \right)^2} = 16\)  
B.\({\left( {x + 2} \right)^2} + {\left( {y - 5} \right)^2} + {\left( {z - 1} \right)^2} = 4\)
C.\({\left( {x + 2} \right)^2} + {\left( {y - 5} \right)^2} + {\left( {z - 1} \right)^2} = \dfrac{{25}}{9}\)
D.\({\left( {x - 2} \right)^{^2}} + {\left( {y + 5} \right)^2} + {\left( {z + 1} \right)^2} = 16\)

A.2                   
B.1                    
C.3                         
D.4

A.\(\sqrt {11}  - \sqrt 5 \)                    
B.6                   
C.\(\sqrt 5  - \sqrt {11} \)                          
D.3

A.\(x - 5y - z + 18 = 0\)  
B.\(x - 5y + z - 22 = 0\)
C.\(x + 5y - z + 18 = 0\)  
D.\(x + 3y - z + 12 = 0\)

A.\(( - 1;1).\)
B.\(( - 3;1)\)
C.\((1;3).\)
D.\(( - 1;3).\)

A.\(78\pi \)
B.\(650\pi \) 
C.\(325\pi \) 
D.\(39\pi \)

A.2 
B.0  
C.4  
D.6

A.what you have done
B.that you have done
C.what have you done
D.whether have you done

A.the fact that the president was in poor health
B.why the president was in poor health
C.that the president was in poor health
D.that was the president in poor health