20. What is the equation of a circle with a center at (-4,-8) and a radius of 1.9?

(x + 4)^2 + (y + 8)^2 = 1.9^2 = 3.61

Step-by-step explanation:

the standard equation of a circle with center at (h, k) and with radius r is

(x - h)^2 + (y - k)^2 = r^2.  Here, (-4, -8) is (h, k) and 1.9 is r.

Then the desired equation is:

(x + 4)^2 + (y + 8)^2 = 1.9^2 = 3.61