Answer:
(- 4, 3 )
Step-by-step explanation:
Under a counterclockwise rotation about the origin of 90°
a point (x, y ) → (- y, x ) , then
(3, 4 ) → (- 4, 3 )
.....
................thanks.......
49°
arccos x = 15/23
v = 86
v + 6 = 92
-6 -6