Answer:
The line of Number:
The bottom line of the staff is the fifth line, also known as line number 5. The staff is a set of five horizontal lines that are used in musical notation to indicate pitches. Each line and space on the staff represents a specific pitch, with the bottom line being the lowest pitch and the top line being the highest pitch within that particular staff. The exact pitch represented by the bottom line depends on the clef used, as different clefs assign different pitches to the lines and spaces of the staff.
