Quick Answer. The formula bar is a feature in Microsoft Excel that enables users to create and view formulas. It is typically labeled with a function symbol (fx), and it is sometimes referred to as the formula box. Continue Reading.
An audio commentary is an additional audio track, usually digital, consisting of a lecture or comments by one or more speakers, that plays in real time with a video. Commentaries can be serious or entertaining in nature, and can add information which otherwise would not be disclosed to audience members.[1]
Supplement. A supplement is a publication that has a role secondary to that of another preceding or concurrent publication. A follow-on publication complements its predecessor, either by bringing it up-to-date, or by otherwise enhancing the predecessor's coverage of a particular topic or subject matter, as in the Tosefta.