Identify the center and radius of the circle..

B

Step-by-step explanation:

(x-h)^2 + (y-k)^2 = r^2 ; here (h,k) is co-ordinate of the center and r is the radius.

So, comparing this equation wth the given one,

we get,  h = -4, k = 2, r = 4

[If there's any mistake, please inform me]

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons