A.\(\dfrac{3}{7}\)          
B.\(\dfrac{9}{{21}}\)
C.\(\dfrac{{ - 3}}{7}\)             
D.\(\dfrac{{ - 9}}{{21}}\)

A.\(\dfrac{{11}}{{ - 6}}\)
B.\(\dfrac{6}{{11}}\)
C.\(\dfrac{{ - 6}}{{ - 11}}\)
D.\(\dfrac{{ - 11}}{{ - 6}}\)

A.\(8\).
B.\(5\).
C.\(6\).
D.\(4\).

A.\(59\).
B.\(58\).
C.\(116\).
D.\(115\).

A.\(\dfrac{{33}}{4}\).
B.\(\dfrac{{65}}{8}\).
C.\(\dfrac{{49}}{8}\).
D.\(\dfrac{{57}}{8}\).

A.\(\dfrac{{20\sqrt {14} {a^3}}}{{81}}\).
B.\(\dfrac{{40\sqrt {14} {a^3}}}{{81}}\).
C.\(\dfrac{{10\sqrt {14} {a^3}}}{{81}}\).
D.\(\dfrac{{2\sqrt {14} {a^3}}}{9}\).

A.\(\dfrac{{25}}{{42}}\).
B.\(\dfrac{5}{{21}}\).
C.\(\dfrac{{65}}{{126}}\).
D.\(\dfrac{{55}}{{126}}\).

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

A.\(3\).
B.\(1\).
C.\(2\).
D.\(0\).

A.\(\left[ {0\,;\, + \infty } \right)\).
B.\(\left( { - \infty \,;\,0} \right)\).
C.\(\left( {0\,;\, + \infty } \right)\).
D.\(\left( { - \infty \,;\, + \infty } \right)\).