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The domain of the function represents the values that x can take on in this context. In this case, x represents the number of shirts sold.
Since Henry ordered 600 shirts, the maximum number of shirts he can sell is 600. Therefore, the domain of the function is x ≥ 0 and x ≤ 600.
So, the domain of the function in this context is 0 ≤ x ≤ 600.