A.\(72\pi \)
B.\(140\pi \)
C.\(144\pi \)
D.\(288\pi \)

A.\(m = 0\,;\,\,m = 1\)
B.\(m = 0\,;\,\,m = 2\)
C.\(m = 0\,;\,\,m =  - 2\)
D.\(m = 0\,;\,\,m =  - 1\)

A.\(20\)
B.\(25\)
C.\(30\)
D.\(32\)

A.
B.
C.
D.

A.
B.
C.
D.

A.\(13.\)
B.\( \pm 13.{\kern 1pt} \)
C.\(17.\)
D.\(169.\)

A.\(m \ne  - 1\)
B.\(m \ne 0\)   
C.\(m = 1\)                       
D.\(m \ne 1\)

A.\(\left\{ \begin{array}{l}3x - 4y = 1\\x - 5y = 4\end{array} \right.\).
B.\(\left\{ \begin{array}{l}3x + 2y = 8\\2x - 5y = 18\end{array} \right.\).
C.\(\left\{ \begin{array}{l}x + y = 6\\x - y = 2\end{array} \right.\).         
D.\(\left\{ \begin{array}{l}x - y = 3\\3x + 2y = 5\end{array} \right.\)

A.\(4\)
B.\(9\)
C.\(7\)
D.\(-9\)

A.\({x^2} - 3x - 5 = 0\).
B.\({x^2} - 3x + 5 = 0\) .
C.\({x^2} + 3x - 5 = 0\).
D.\({x^2} + 3x + 5 = 0\)