A.\(m = 2;m =  - 2\).  
B.\(m =  - 2\).
C.\(m = 4\).
D.\(m = 2\).

A.\(x =  - 4\,;\,\,x =  - 1\)
B.\(x = 4\,;\,\,x = 1\)
C.\(x = 4\,;\,\,x =  - 1\)
D.\(x =  - 4\,;\,\,x = 1\)

A.\(2\)
B.\( - 1\)
C.\({45^0}\)
D.\(1\)

A.\(20{m^2}\)
B.\(24{m^2}\)
C.\(100{m^2}\)
D.\(48{m^2}\)

A.\(4,71\left( {km} \right)\).        
B.\(9,42\left( {km} \right)\).         
C.\(18,84\left( {km} \right)\).                                  
D.\(30\left( {km} \right)\).

A.\({35^0}\).
B.\({37^0}\) .
C.\({36^0}\) .
D.\({38^0}\).

A.\(\dfrac{{40\pi }}{9}\left( {c{m^2}} \right)\).
B.\(\dfrac{{400\pi }}{9}\left( {c{m^2}} \right)\).                        
C.\(\dfrac{{1200\pi }}{9}\left( {c{m^2}} \right)\).            
D.\(\dfrac{{3200\pi }}{9}\left( {c{m^2}} \right)\).

A.\(A = 7\sqrt 2 .\)
B.\(A =  - 5\sqrt 2 .\)
C.\(A =  - 9\sqrt 2 .\)
D.\(A =  - 7\sqrt 2 .\)

A.\(B = \dfrac{{2x}}{{1 - x}}\)
B.\(B = \dfrac{{2x}}{{x - 1}}\)
C.\(B = \dfrac{x}{{1 - x}}\)
D.\(B = \dfrac{x}{{x - 1}}\)

A.\(b)\,\,\left( {1;1} \right)\,\,;\,\,B\left( {2;4} \right)\)
B.\(b)\,\,\left( { - 1;1} \right)\,\,;\,\,B\left( { - 2;4} \right)\)
C.\(b)\,\,\left( { - 1;1} \right)\,\,;\,\,B\left( {2;4} \right)\)
D.\(b)\,\,\left( {1;1} \right)\,\,;\,\,B\left( { - 2;4} \right)\)