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f(17.5) = 6(17.5) - 70 = 105 - 70 = 35
f(17.5) = 35, meaning if the company sells 17.5 shirts, they would make a profit of $35. This interpretation makes sense in the context of the problem because it is a valid result based on the given function.
The appropriate domain for the function is the set of all real numbers greater than or equal to 0, since the company cannot sell a negative number of shirts.