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

Condense each logarithm. (express as a single log)pick a right chose
log 12 + 4log 2 - log 3

a.log 32
b. log 64
c. log 2
d. log 3

What fraction names the shaded part of each of the following figures?

There is a pic of a rectangle split into 7 sections and 3 of the sections are colored red.
would the answer be numerator? Help.