In this context, the independent variable is the number of dances Shawna plans to participate in (i), and the dependent variable is the number of costumes required (d). This is because the number of costumes depends on how many dances she will perform.
So the correct identification of the variables is:
- Independent Variable (i): the number of dances Shawna plans to participate in
- Dependent Variable (d): the number of costumes required