The dominant in a scale is the 5th, which in the key of F# major is C#.
The mediant of any major scale is the note that is a third above the tonic (root) of the scale. In the key of F sharp major, the tonic is F sharp, so the mediant would be A sharp.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The G-major scale has only one sharp (which is F#)
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
G Major has one sharp, which is F sharp.
The dominant in a scale is the 5th, which in the key of F# major is C#.
The dominant is the 5th tone in the scale. In a D Major scale, the dominant is A.
The mediant of any major scale is the note that is a third above the tonic (root) of the scale. In the key of F sharp major, the tonic is F sharp, so the mediant would be A sharp.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The subdominant of F major A sharp (A#)
The dominant note is the 5th note in the scale. In the B Major scale, F is the dominant note.
The dominant of B is F#.
E to F-sharp is one whole step. F-sharp is a major 3rd above D, so it's part of the D major scale.
The G-major scale has only one sharp (which is F#)
C, F, and G are sharp in this scale.
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
F sharp