Explanation:
The sum of (-2 3/4) and 5/g is not necessarily rational. A rational number is a number that can be expressed as the ratio of two integers, where the denominator is not zero. (-2 3/4) is a rational number because it can be expressed as the ratio of two integers: -11/4. However, 5/g is only rational if g is an integer and not equal to zero. If g is not an integer or is equal to zero, then 5/g is not rational, and the sum of (-2 3/4) and 5/g would not be rational either. So, without knowing the value of g, we cannot determine if the sum of (-2 3/4) and 5/g is rational or not.