Question 18 (5 points) is tangent to circle A. Determine the length of .

Question 18 options:

1)

4

2)

5

3)

3

4)

6
Question 19 (5 points)
What's the standard equation of the circle with the general equation x2 + y2 + 4x – 2y – 20 = 0?
Question 19 options:

1)

(x + 1)2 + (y – 2)2 = 5

2)

(x + 2)2 + (y – 1)2 = 25

3)

(x – 2)2 + (y + 1)2 = 25

4)

(x + 2)2 + (y – 1)2 = 5