What is the center and radius of the circle with equation (x - 5)2 + (y + 3)2 = 16? a.) center (3, -5); radius = 4 b.)center (5, -3); radius = 4 c.)center (5, -3); radius = 16 d.)center (-5, 3); radius = 16

(x - 5)2 + (y + 3)2 = 16 should be written as   (x - 5)^2 + (y + 3)^2 = 16.
Compare this to (x-h)^2 + (y-k)^2 = r^2.  See that r^2 = 16?  Then r = 4 units.

5 corresponds to h and -3 corresponds to k.  Thus, B is correct.