book Maths Puzzle Numerical Ability

the conjugate of
sqare_root(2)-square_root(3) is:
square_root(2)+square_root(3).

But can it be:
-sqare_root(2)-square_root(3)?

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book Other Question

Determine whether the relation is a function.

X |-5|0|2|6|
__________________
Y | 0|1|2|3|


A) Function

B) Not a function
How many liters (L) of a 10% silver iodide solution must be mixed with 7 L of a 4% silver iodide solution to get a 6% solution?