Which of the following is irrational?

The number

 $If\ \left(2^3\right)^2=4^x,\ then\ 3^x=?$  

The value of $\left\{8^{-\frac{4}{3}}\div2^{-2}\right\}^{\frac{1}{2}}$  is :

 $If\ x=\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}$  and $y=\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}$  then  $x+y+xy=?$  

 $If\ x+\frac{1}{x}=5$  , then $x^2+\frac{1}{x^2}=?$  

 $The\ value\ of\ \frac{\left(2.3\right)^3-0.027}{\left(2.3\right)^2+0.69+0.09}$  is:

 $If\ x^3+6x^2+4x+k$  is exactly divisible by x + 2, then k = ?

Two straight lines AB and CD cut each other at O. If

If two interior angles on the same side of a transversal intersecting two parallel lines are in the ratio 2 : 3, then the measure of the larger angle is :

The side BC of $\Delta ABC$  is produced to a point D. The bisector of $\angle A$  meets side BC in L. If $\angle ABC=30\degree$  and  $\angle ACD=115\degree$  , then  $\angle ALC=?$  

The base BC of $\Delta ABC$  is produced both ways and the measure of exterior angles formed are $94\degree\ and\ 126\degree$  , then  $\angle BAC=?$  

 $If\ \Delta ABC\cong\Delta FDE$  and AB = 5 cm,  $\angle B=40\degree$  and $\angle A=80\degree$  . Then, which of the following is true?

The abscissa of a point is positive in the

The distance of the point P(4, 3) from the origin is:

If (4, 19) is a solution of the equation y = ax + 3, then a = ?

The graph of the linear equation 2x - y = 4 cuts x-axis at:

If one angle of a parallelogram is $24\degree$  less than twice the smallest angle, then the measure of the largest angle of the parallelogram is :

ABCD is a parallelogram and E is the mid point of BC. DE and AB when produced meet at F. Then, AF = ?