The answer would be 13.3125 because 6.25 / 0.8 is 7.8125 than add 5.5 which will equal 13.3125. I'm sure about this.
A source is where you can look to find info. Multiple means many or some.
Therefore, a multiple source test is a test that you can find the answers in multiple sources, such as a book, article, journal, etc.
In the year 2028 I don't believe our digital video viewing experience would change too much considering most, if not all, the population is already satisfied with how easy, simple, and versatile our current experience is. If everything changes one thing will for sure remain unchanged. That one thing is cinemas, I don't think cinemas will ever change much as they provide a constant source of revenue while providing a place for family and friends to get together to watch a movie before it becomes available to other sources.