exam Maths Puzzle Numerical Ability

hello i am having trouble trying to solve radicals with letters in them.(i know there is mathmatical word for letters i just forgot) here is one of the questions.
the square root of 360x^5y^4
thank you

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exam Other Question

The cost of using a calling card is $.95 for the first minute and $.35 for each additional minute. The function is C (t)=.95+.35(t1) where t=time in minutes. What is the charge for 12 minutes?

Thank you.
Please help me........Again! It asks: O is the center of the circle, BC equals 10 and OC=13, What is OA?
Please and Thank You=)