PLEASE HELP QUICK 50 POINTS!!!!!! WILL MARK BRAINLIEST IM BEGGING PLEASE I DONT UNDERSTAND IT

Answer:
K' = (-3,-4)
U' = (-6,-1)
B' = (0,-2)
Step-by-step explanation:
Hope that helps!
Answer:
K'(-3,-4) U'(-6,-1) B'(0,2)
Step-by-step explanation:
The formula for a 90 degree counterclockwise rotation is (-y,x) ; just apply that to this.