Almost All ensembles of instruments in any genre are designed to be able to cover the full audio spectrum from Bass to soprano. The brass instruments cover three ranges in the area; Bass, Treble, and alto.
The Trumpet is a treble to alto range instrument.
The Trombone is a Treble to bass instrument.
The Sousaphone or Euphoniums are bass to double bass instruments.
However, having said that, Jazz is not a particular style played with a particular set of instruments. It is a catchall name for any improvised music played on any instrument. All of the brass family of instruments have been used in Jazz bands. Equally all brass instruments are used in Classical Music.
For a small Dixie style band you would expect to see;
A trumpet
A trombone
A Banjo
A Sousaphone, Bombadon, or other bass brass instrument.
Drums
But even this isn't the minimum or maximum line up or even the definitive list of instruments that can or cannot be used.
All Jazz Music is by definition, experimental to a greater or lesser degree.
A full jazz band usually has four, maybe five trumpets. Some charts only use three.
Also trumpets, trombones, drums,
It is commonly used in Jazz music, and is usually used for Trumpets and Trombones.
Trumpet and tenor trombone are the most common. Sometimes the cornet is used instead of the trumpet or a tuba instead of a string bass. In marching jazz bands the sousaphone is often used to provide the bass line. In the Big Band lineup a fourth trombone part is often added for a bass trombone.
improvisation
A full jazz band usually has four, maybe five trumpets. Some charts only use three.
In jazz, the 1st trumpets tend to play the melody and the 2nd, 3rd, etc play the accompaniment. Their loud sound tends to stand out so they are given important roles. Often, the trumpets share the melody throughout jazz pieces with the saxaphones as they are both, overall, the main build of a jazz group.
as many as you want
Trumpets are in B flat because it is a key that allows the instrument to play in a comfortable range and produce a bright, clear sound that is commonly used in classical and jazz music.
Trumpets are used in all types of music from classical to avant guarde to Jazz.
They are played in jazz bands,symphonies, and some orchestras.
Also trumpets, trombones, drums,
They are used in concert, marching, jazz, and symponich bands. They are considered some on the loudest instruments in the brass section and are very important. In music, they usually have the melody in a song.
It is commonly used in Jazz music, and is usually used for Trumpets and Trombones.
Trumpets were first used in ancient battles.
Trumpet and tenor trombone are the most common. Sometimes the cornet is used instead of the trumpet or a tuba instead of a string bass. In marching jazz bands the sousaphone is often used to provide the bass line. In the Big Band lineup a fourth trombone part is often added for a bass trombone.
improvisation