This specific filename suggests it is the 10th version (indicated by the (9) ) of a generic file named "j" that was downloaded to your device. Without more context, I can't see the contents, but here is what that usually means and how you can access the text inside: What is this file?
: Open your Downloads folder on your computer or phone. Unzip/Extract : Windows : Right-click the file and select "Extract All..." Mac : Double-click the file. Download File j (9).zip
If it was from a specific website or a school portal, I might be able to help you figure out what information is supposed to be inside. This specific filename suggests it is the 10th