The answer is 8:45. Enjoy!
17. Its answer C i wil tell you the other one in a sec
Sydney is 44 years old.
50-6=44
Hope i helped.
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For any circle with Cartesian equation

,
we have that the centre of the circle is

, and the radius of the circle is

.
So in the case that

,
we essentially have that

.
So the centre of the circle is

, and the radius is

.