Find the center and radius of the circle.
(x – 5)2 + (y – 7)2 = 81
Center:(
Radius:

Center (5,7) radius: 9

Step-by-step explanation:

The standard equation of a circle is

(x-h)^2+(y-k)^2=r^2

where the center is (h,k) and r is the radius

so in this case h is 5 k is 7

and r^2=81 so r=9

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.