You are traveling upstream on a river at dusk. you see a buoy with the number 5 and a flashing green light. what should you do>

You should pass the buoy by the left side

Explanation:

A combination of a green light and the number 5 signify the left side of the boat or the port side as the boat goes upstream. These buoys, lighted or not indicate safety procedures to be followed or provide boaters with some information about the area they are. They can restrict movement, designate an area as a swimming area or indicate how to pass the signs, much like road signs.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.