A.\(\sqrt {38} \)
B.\(8\)
C.\(12\)
D.\(2\sqrt {10} \)

A.\( - \dfrac{3}{2}\)
B.\( - 1\)
C.\(3\)
D.\(1\)

A.\(\dfrac{1}{2}\)
B.\(\dfrac{{27}}{2}\)
C.\(0\)
D.\( - \dfrac{{19}}{4}\)

A.\(4\)
B.\(10\)
C.\(0\)
D.\(9\)

A.\(\dfrac{4}{{\ln 2}} - 4{\log _2}\left( {\dfrac{4}{{\ln 2}}} \right)\)
B.\(4\left( {1 - {{\log }_2}3} \right)\)
C.\( - 4\)
D.\(4{\log _2}6\)

A.\(1 \le m \le 16\)
B.\(0 \le m \le 2\)
C.\(3 \le m \le 8\)
D.\(4 \le {\rm{m}} \le 8\)

A.\(\dfrac{5}{6}\)
B.\(\dfrac{6}{5}\)
C.\(\dfrac{5}{4}\)
D.\(\dfrac{4}{5}\)

A.\(e - 2\)
B.\(\dfrac{{{e^2}}}{4}\)
C.\(\dfrac{{e - 1}}{2}\)
D.\(\dfrac{e}{2}\)

A.\(3\)
B.\(4\)
C.\(2\)
D.\(1\)

A.\(75m\)
B.\(40m\)
C.\(15m\)
D.\(60m\)