exam Maths Puzzle Numerical Ability

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=)

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exam Other Question

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 Tell wether the number is prime or composite. If it is composite,write its prime factorization.

7.163

Any help with this equation would be GREATLY appreciated.