book Maths Puzzle Numerical Ability

x=the squareroot of 6-x

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book Other Question

The end points of a circle are A (-1,1) and B(0.5,-3).

a) Find the coordinates of the centre of the circle
b) find the radius of the circle
2 t
--- = ----
t 5t-12

on this one you take 2 divided by t = t divided by 5t-12
I just need to know what to do with this problem. Thanks.