A.\(6i\)
B.\( - 4\)
C.\(6\)
D.\(4\)

A.\(x = 2\)
B.\(y = 1\)
C.\(y = 2\)
D.\(x = 1\)

A.\(y = 0\)
B.\(y + z = 0\)
C.\(z = 0\)
D.\(x = 0\)

A.\(\overrightarrow d  = \left( { - 9;3; - 6} \right)\)
B.\(\overrightarrow a  = \left( { - 3;1; - 2} \right)\)
C.\(\overrightarrow c  = \left( {6; - 2;4} \right)\)
D.\(\overrightarrow b  = \left( { - 3;1;2} \right)\)

A.\(y = {x^4} - {x^2} + 1\)
B.\(y = {x^3} - 3x + 1\)
C.\(y =  - {x^3} - 3x + 1\)
D.\(y =  - {x^2} + x - 1\)

A.\(\pi Bh\)
B.\(\dfrac{1}{3}Bh\)
C.\(Bh\)
D.\(\dfrac{1}{3}\pi Bh\)

A.\(3\)
B.\( - 3\)
C.\( - 1\)
D.\(1\)

A.\(3{\log _a}b\)
B.\(\dfrac{1}{3}{\log _a}b\)
C.\(3 + {\log _a}b\)
D.\(\dfrac{1}{3} + {\log _a}b\)

A.\(13\)
B.\( - 7\)
C.\(5\)
D.\( - 10\)

A.\(\sqrt {{{2021}^x}}  = {\left( {\sqrt {2021} } \right)^x}\)
B.\({\left( {{{2021}^x}} \right)^2} = {\left( {2021} \right)^{{x^2}}}\)
C.\({\left( {{{2021}^x}} \right)^2} = {\left( {2021} \right)^{2x}}\)
D.\(\sqrt {{{2021}^x}}  = {2021^{\dfrac{x}{2}}}\)