Final answer:
A firefighter must maintain a 90 degree max from inline when operating a hoseline from a ladder.
Step-by-step explanation:
When operating a hoseline from a ladder, a firefighter must maintain a 90 degree max from inline. This means that the hoseline should not be extended in a way that exceeds a 90 degree angle relative to the ladder. Maintaining this angle ensures that the firefighter has better control over the hoseline and reduces the risk of kinks or blockages that could restrict the water flow.