A circle is centered at (5,-9) and has a radius of 12. Which of the following is the equation for this circle? a: (x-5)^2+(y+9)^2=12
b: (x-5)^2+(y+9)^2=144
c: (x+5)^2+(y-9)^2=144
d: (x+5)^2+(y-9)^2=12

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