Answer:
5 units
Explanation:
from the figure A and B have the following coordinates:
A (0,0)
B (3,-4)
Using the formula for distance between two points (see attached)
in this case x1 = 0, x2= 3, y1=0,y2=-4
D = √[( 3-0 )² + (-4-0)²]
D = √[3² + (-4)²]
D = √[9 + 16]
D = √25
D = 5 units