exam Maths Puzzle Numerical Ability

sqrt3 sqrt3
----- - -----
sqrt6 -1 sqrt6 + 1

sqrt9x^2 = x + 6

I am having a hard time figuring these out. Can you help?(sqrt means square root)

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exam Other Question

What is the inverse of the function y=logbase2 x????
Is it:
a)y=2^-x
b)y=2^x
c)y=x^2 or
d)y=logbase2 2 ???? indicate whether each statement is true Always, Sometimes, or never.
a. If a triangle is obtuse, it is isosceles.
b. The bisector of the vertex angle of a scalene triangle is p