Answer:
Step-by-step explanation:
To determine the subtraction expression represented by the model, we first need to identify the fractions represented by the shaded part and the "X".
Let's denote the shaded part fraction as A and the fraction represented by "X" as B.
The model shows that fraction A was subtracted by fraction B, which can be represented as A - B.
Therefore, the subtraction expression represented by the model is A - B.