Final answer:
The mixed expression y - 1 - (5/y + 3) is correctly expressed as a single fraction in option B: y - 1 - 5 / (y + 3).
Step-by-step explanation:
The question is asking to change the mixed expression to a fraction. The mixed expression given is y - 1 - (5/y + 3). To convert this into a fraction, we must keep the terms in a single fraction by finding a common denominator. Since 'y' and 'y + 3' cannot be directly combined, we look for a way to unify them. The common denominator for the terms involving 'y' would be 'y * (y + 3)'.
However, in the provided expressions, there's no need for this as we just have a subtraction involving an integer, a variable, and a fraction with a variable in the denominator. Without altering the original expression, the correctly formatted answer is y - 1 - 5 / (y + 3). No algebraic manipulation is required as the goal is just to express the mixed expression as a whole.