book Maths Puzzle Numerical Ability

My question says to simplify the radicals.

square root of 44- the square root of 11

Could you help me? thanks!
How do you write the square root sign on a computer?

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book Other Question

Find two numbers with a geometric mean of the square root of 24 given that one number is two more than the other

Could you help me?
I have a right triangle I have to find the area for

On the figure they have points a b c
A to C 6ft C to B is 9ft and I must need A-B
the right triangle does show a 90 degree at point C