The domain of a situation typically refers to the set of all possible input values for which the function is defined. In this context, since the student worked out continuously for 30 minutes, the time in minutes would be the input variable.
Assuming the workout begins at time \( t = 0 \) (start of the workout) and ends at time \( t = 30 \) (end of the workout), the domain of the function representing the remaining percentage of the workout as a function of time would be:
\[ \text{Domain: } [0, 30] \]
This means that the variable \( t \) can take on any value from 0 to 30, inclusive. If choices were provided, the correct answer would be expected to reflect this interval.
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