6. The diagram shows the number of instruments in the string section of an orchestra. There are 7 cellos, 4 double basses, and 11 each of first violins, second violins, and violas. A. Use ratio notation and decimal notation to describe the relationship between the number of double basses and the total number of instruments in the string section. B. Is the relationship in Part A rational or irrational? Give two different justifications for your answer.