Final answer:
Two practices to reduce the file size of a published Flash document are compressing audio and video files and using vector graphics. Minimizing the use of fonts and cleaning up library items can also contribute to file size reduction.
Step-by-step explanation:
To reduce the file size of a published Flash document, one can implement two effective practices. First, compressing audio and video files within the Flash document can have a significant impact. It is important to reduce the bitrate of audio files and to optimize video files for the web without compromising too much on quality. Second, using vector graphics instead of bitmaps where possible can also decrease the file size. Vector graphics are generally smaller in size because they are defined by mathematical equations rather than pixel data.
Additionally, minimizing the use of fonts by limiting the number of font styles and using system fonts can help. It's also good practice to remove any unused library items, symbols, and media before publishing to ensure no extra data is being included unnecessarily.