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QUESTION 1

The given circle has equation:

We can rewrite to obtain;

This is equation is now in the form;

Where (h,k)=(0,0) is the center of the circle and is the radius.

QUESTION 2

The center of the circle is at (1,1) and passes through the point (4,5).

The radius of this circle is given by;

units.

We substitute into the formula;

Expand if you wish;

step-by-step explanation:

10.50 + taxes which added up to 11.50