Answer: Approximately 6.4 units
==================================================
Step-by-step explanation:
The origin is the point (0,0)
Use the distance formula to find the distance from (0, 0) to (4, -5)
Let

be our two points. Plug those values into the distance formula below and use a calculator to compute

The distance between the two points (0,0) and (4,-5) is approximately 6.4 units.