Answer:
B
Step-by-step explanation:
Answer:
C.
Step-by-step explanation:
6≤x<21
Answer:
5 &x = 14
Step-by-step explanation:
Answer:
x² + 2x + y² + 4y = 20
(x² + 2x + 1) - 1 + (y² + 4y + 4) - 4 = 20
(x + 2)² + (y + 4)² - 5 = 20
(x + 2)² + (y + 4)² = 25
Therefore, the center is (-2, -4) and the radius is √25 = 5.