9.
(2, 2), quadrant I (3,−1), quadrant IV (−1, 0), x-axis (−2,−5), quadrant III (0, 0), origin (−7, 4), quadrant II (0, 3), y-axis (−4, 2), quadrant II
11.
On the y-axis
Vertical line intersecting the x-axis at −1
13.
y>0
y<0
x<0
x>0
15.
4
(2, 3)
17.
13−−√
(0.5,−4)
19.
45–√
(1,−2.5)
21.
1
(2–√, 4.5)
23.
2–√|t−k|
(t+k2, t+k2)
25. Yes
27. Yes
29. Yes
31. No
33. (−3, 2), (−2, 4), (−1, 6)
35. Isosceles
37. Scalene
39. Scalene
41. Equilateral
43. d(P, R)=d(Q, S)=172–√
45. −2 or 6
47. (−87, 0)
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