exam Maths Puzzle Numerical Ability

ADDING AND SUBBTRACTING RADICALS
HOW TO:
16 (square root)10 + 2 (square root)10
(SQUARE ROOT)5 - 3 (SQUARE ROOT)5
(SQUARE ROOT)3 (SQUARE ROOT)2 + 2 (SQUARE ROOT)3)

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exam Other Question

How do I find the slope? x=4 add. write in simplest form:

4 6
----- + -----
xy xy

The answer to this is:
10
----------
x^2y^2
Is this correct? Thank you so very much