Final answer:
The flash act tap style focused on the rhythm and percussion of tapping without other dance influences or upper body movements. This became popular during the Roaring Twenties.
Step-by-step explanation:
The statement "The flash act tap style focused on the rhythm and percussion of tapping without other dance influences or upper body movements" is true.
The flash act tap style emerged in the 1920s and was characterized by its emphasis on rhythm and percussion. Dancers in this style focused solely on the sounds produced by their footwork, without incorporating other dance influences or upper body movements. This style became popular during the Roaring Twenties, also known as the Jazz Age, and was synonymous with the energetic and lively spirit of the time.