exam Maths Puzzle Numerical Ability

Can someone please show me how to simplify this?

Square root 36x^5 (fifth power)

Thank you!

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exam Other Question

I need to strengthen a mixture that is 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 liters of the 10% mixture?

How many liters of 94-octane gas should solve the system by additio or substitution
3x+6y=0
x= 2/3

I have no idea how to work this problem with a fraction. Please help.