R/9 = -21
Multiply by 9
r = -189
Hello!
The equation for a circle is

(h,k) is the center
r is the radius
Put in the values you know

Simplify

The equation is

Hope this helps!
Answer: k ≤ -4 or k ≥
<u>Explanation:</u>
| 3k + 4 | ≥ 8
3k + 4 ≥ 8 or 3k + 4 ≤ -8
<u> -4</u> <u> -4 </u> <u> -4</u> <u>-4 </u>
3k ≥ 4 or 3k ≤ -12
<u>÷3 </u> <u>÷3 </u> <u> ÷3 </u> <u>÷3 </u>
k ≥
or k ≤ -4