Final answer:
In a first inversion F-sharp minor triad, the bass note is A.
Step-by-step explanation:
In a first inversion F-sharp minor triad, the bass note is A. In music theory, a triad is a three-note chord consisting of a root, a third, and a fifth. The bass note is the lowest note in the triad, and in first inversion, it is the note that is played one octave higher than the root.