It may be a good idea but my answers are wrong as I mis-read the two questions. If I'm right about the reciprocals bit then the correct answers I reckon are: 13) c^4 14) 1 / x^6 (I'm happy to sit at the back of the class)

From the context I assume it represents 'the reciprocal of'. So with the implied multiply operator we'd get 13) 4 14) 1 / 3x^2 But what do I know - I'm 65!