Final answer:
The domain of the profit function P = 6t + 10s is defined for all s > 0 and t > 0.
Step-by-step explanation:
The profit function P = 6t + 10s represents the total profit based on the values of t and s. To determine the domain of the profit function, we need to consider the possible values that t and s can take.
Option A states that the profit function is defined for all s > 0 and t² ≥ 0. This is incorrect because t² can be negative, and the function would not be defined for negative t² values.
Option B states that the profit function is defined for all s > 0 and t > 0. This is correct because t > 0 ensures that the function is defined for positive t values.
Therefore, the correct option is B: Is the profit function defined for all s > 0 and t > 0?