A circle has a radius of
13 units and is centered at (-9.3, 4.1).
Write the equation of this circle.

(x+9.3)²+(y-4.1)²=169

Step-by-step explanation:

The common equation for a circle in the coordinate plane is:

(x-h)²+(y-k)²=r²

Where (h,k) is the point at the center of the circle and r is the radius:

Here (h,k) is (-9.3, 4.1) and r is 13.

Using this we can substitute to find:

(x-(-9.3))²+(y-(4.1))²=13²

And using arithmetic to simplify we find that the equation of the circle is:

(x+9.3)²+(y-4.1)²=169

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

14

step-by-step explanation: