book Maths Puzzle Numerical Ability

In the diagram above, if O is the centre of the circle, then y=

(A) 25 degrees
(B) 80 degrees
(C) 90 degrees
(D) 100 degrees

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book Other Question

I need help evaluating this expression:

Log base 10 multiplied to (.01) raised to the 3rd power

Thanks
Michael V Hi,
Could someone please answer this for me
Tell whether a triangle with side of the given lengths 15,15,21.2
is 45,-45,-90 degrees 30,-60,-90 degrees or neither
I gave 45,-45,-90 and the answer was marked wrong.
Thanks