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

A.to take which English course
B.which English course you should take
C.that which English course to take
D.which English course should you take

A.which was her son kidnapped
B.which her son was kidnapped
C.that her son was kidnapped
D.that was her son kidnapped

A.to live
B.where you live
C.how you to live
D.where do you live