Assuming the key signature has only one flat (B Flat) then the key is either F Major, or D minor.
The key signature that has B flat, A flat, E flat and D flat is Concert A flat Major.
The key signature will consist of two flats: Bb, and Eb.
well the minor scale was unfortunait used to be b flat then it was changed to e flat.
6 flats. B, E, A, D, G and C.
F# minor, which has 3 sharps in the key signature.
The key signature for F major has one flat (B flat) , while the key signature for F minor has four flats (B flat, E flat, A flat, and D flat).
The key signature that has B flat, A flat, E flat and D flat is Concert A flat Major.
The key signature with only a B-flat is either F major or D minor.
A flat lowers the note by a semitone. As a key signature, a single flat indicates the key of F, meaning your B should be flat. Two flats are E and B, meaning the key is therefore B flat. B, E and A flat indicate the key of E flat ... and so on.
There is no key signature that has Bb and C#.
That is the signature for the key of Db. Or, it's relative minor, Bb minor.
No key signature has two of the same flat or sharp.
B flat and E flat
One flat, B-flat.
B flat
B flat, E flat, A flat, D flat
That is C Minor