Answer
$(x+2.4)^2+(y+2.7)^2=900$
Work Step by Step
The standard form of equation of a circle is: $(x-a)^2+(y-b)^2=r^2$ where $(a,b)$ is the center of the circle and $r$ is the radius.
Thus here after plugging in $(a,b)=(-2.4,-2.7),r=30$: $(x-(-2.4))^2+(y-(-2.7))^2=30^2\\(x+2.4)^2+(y+2.7)^2=900$
