exam Maths Puzzle Numerical Ability

Here is another one i have been stuck on. Thank you for all of your help.
2(3x+2)+4

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exam Other Question

The length of a rectangle is 5m greater than the width.
The perimeter is 150m. find the width and length.
How do you deal with square roots within square roots, for example

sqrt(4 + 2sqrt3)/sqrt2?

Thank you for your help!