Answer:
The center of the circle is  (2.5,  5.4) and the radius of the circle is 1.1
Step-by-step explanation:
We are to find the center and radius of the circle whose equation is given as;
(x − 2.5)² + (y + 5.4)² = 1.21  ----------------------------------------------------(1)
All we need to do is to compare it with a standard equation of a circle.
A standard equation of a circle with center (a,b) and radius r is given as;
(x -a)² + (y - b)² = r²   ---------------------------------------------------------(2)
where a, b is the center of the circle and r is the  radius of the circle
Comparing equation (1) and (2) 
C(2.5 , 5.4)   
r² = 1.21
But what we are looking for is just r, so we will take the square root of both-side
√r² = √1.21
r= 1.1
Therefore the center of the circle is  (2.5,  5.4) and the radius of the circle is 1.1