66.
if $${{\text{2}}^x} = \root 3 \of {32} $$   then x is equal to = ?

67.
$$\sqrt {12 + \sqrt {12 + \sqrt {12 + .....} } } $$      is equal to = ?

68.
If $${{\text{5}}^{\left( {x + 3} \right)}}{\text{ = 2}}{{\text{5}}^{(3x - 4)}}$$    then the value of x is = ?

69.
$$\frac{{{2^{n + 4}} - 2\left( {{2^n}} \right)}}{{2\left( {{2^{n + 3}}} \right)}}$$    when simplified is = ?

70.
If $$a = \frac{{\sqrt 5 + 1}}{{\sqrt 5 - 1}}$$   and $$b{\text{ = }}\frac{{\sqrt 5 - 1}}{{\sqrt 5 + 1}}$$   then the value of $$\left( {\frac{{{a^2} + ab + {b^2}}}{{{a^2} - ab + {b^2}}}} \right)$$    is = ?

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