exam Maths Puzzle Numerical Ability

sqrt(2+sqrt(2-sqrt(2+x))) =x



1/(1.2.3.0 +1/(4.5.6)+1/(7.8.9)+.....

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exam Other Question

Hello,
can someone tell me if I did this right.
thank you

Find for the following set of numbers:
-3.5, -1.4, -0.5, 3, 5, 1, 2
=-3.5+(-1.4)+(-0.5)+3+5+1+2
=-4.9+2.5+5+1+2
=-4.9+2.5+8
=-2.3+8
=5.7
Find the product: (3 - square root sign 5)(3 + square root sign 5)