Professor Llewellyn Ap-Azard has left his University in Llansteffan, Wales, and is travelling in the United States of America. The Americans persist in using an outdated method of measuring temperature known as the Fahrenheit scale. The professor has concluded that temperatures in Fahrenheit can be converted to the more sensible Celsius scale by applying a two-step conversion formula. The professor, being a mathematician, has encoded those two steps as functions f(x)= (x-32) and g(x)=(5/9)x, which he will compose when he needs to convert. Now, being an absent-minded mathematician, he has forgotten whether the conversion formula should be

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