Respuesta :

The student should have phrased it to be "the difference between the product of 5 and y and 15", as the way the student writes it implies that 5y is being subtracted from 15 instead of the other way around. 

Here, you are to find out if the expression written is correct

The students didn't make any error with the expression he has written

The difference means you should subtract

The product of 5 and y is

5 × y

= 5y

The difference between 15 and the product of 5 and y can be written as

5y - 15

The student is correct

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